Betta fish generally do well with a few smooth, aquarium-ready hiding and resting areas rather than a crowded display. The best decor gives a fish room to swim, a place to retreat, and no sharp or corroding material that could harm delicate fins.
The best steampunk aquarium decor sets for betta tanks are not usually sold as literal clockwork collections. I found that pirate wrecks, retro submarines, aged skulls, castles, and ruins can create the Victorian-industrial mood when they are paired with dark gravel, restrained artificial foliage, and brass-colored accents kept outside the water.
Every product below is based on its supplied listing data and customer-review signals, not a claimed hands-on trial. I gave more weight to smooth resin, usable hideout openings, a stable base, stated dimensions, and the number of reviews; I never assume that a vintage look makes an ornament betta safe.
Table of Contents
The top 3 steampunk-inspired picks cover large, compact, and floating displays
The best steampunk aquarium decor sets for betta tanks in 2026 start with safe fit
This overview covers all 12 analyzed options, from a 2.1-inch floating submarine to a 10-inch ship centerpiece. The comparison is a starting point, not a substitute for checking each item by hand before it enters a cycled aquarium.
1. The XXYOUPIN Pirate Ship is the large centerpiece pick
Extra Large 10 Inch Pirate Ship Aquarium Decor Set for 10-40 Gallon Tank, Resin Sunken Shipwreck with Treasure Chests & Plants, Fish Tank Decorations
10 inch centerpiece
9 piece ship set
Smooth resin
Pros
- 10 inch centerpiece
- 9-piece collection
- Hideouts and swim-through caves
- Smooth resin surfaces
Cons
- Large footprint
- Only 10 reviews
The XXYOUPIN set makes the strongest case when the aquarium has open floor space for one dominant wreck. Its supplied dimensions are 10 by 3 by 7 inches, and the listing places it in 10- to 40-gallon aquariums, so I would not force it into a compact betta setup.
It includes the shipwreck, two treasure chests, and six artificial plants. That nine-piece mix is useful for an industrial shipyard scene because the plants can break up the hard lines of the hull instead of leaving a single oversized object in the middle.
The product data describes smooth, aquarium-safe resin and hollow areas for fish to hide and swim through. Its five-star average comes from 10 reviews, which is positive but still a small review base compared with several later picks.
It fits tanks with a clear 10-inch floor span
A 10-gallon steampunk setup can work if the ship does not block the heater, filter intake, or the betta’s main route across the front glass. I would measure the base, then leave a visible open lane around it before adding substrate and plants.
It works best as one scene rather than crowded scenery
The ship, chests, and plants already establish a complete story. Add only a small retro accent if the tank still has space, because stuffing additional ruins beside a 10-inch ornament can remove the calm resting areas that bettas use.
2. The relaqcc Skull Skeleton gives a wide swim-through feature
relaqcc Aquarium Skull Animal Skeletons, Reptile Tank Accessories, Fish Tank Decorations for Amphibians, Betta Fish, Shrimp, Hermit Crab, Leopard Gecko
10 inch skull
Swim through chambers
Resin build
Pros
- Wide skull design
- Swim-through chambers
- Aeration holes
- Resin construction
Cons
- Single ornament
- Soaking is recommended
relaqcc’s skull skeleton is a 10-inch-long, one-piece resin ornament with swim-through chambers and aeration holes. It is a darker, more weathered route to a clockwork aquarium than a bright castle, especially when the tank uses charcoal gravel and a few muted plants.
The supplied listing says bettas and other small fish can hide, rest, play, and breed around it. I like the practical idea here: a themed focal point also has an actual function, rather than being a solid figurine that only takes up water volume.
It carries a 4.9 average from 146 reviews, the second-largest review base among the fixed ornaments in this guide. Some customer feedback recommends soaking before use, which is sensible preparation for any new aquarium ornament.
It suits a horizontal wreckage composition
The 10 by 3.5 by 3.9 inch proportions favor a low layout rather than a tall tower. Place it toward the back or at one side, with enough clearance at each opening for the fish to turn without scraping its fins.
It needs a close opening and edge inspection
Resin is the stated material, but I still run a clean stocking or soft cloth over every opening and ridge before submersion. Forum keepers repeatedly flag sharp commercial decor as a source of fin tears, and a skull’s decorative contours deserve extra attention.
3. The MaryCarrie Triple Skull Cave supplies the most entrances
MaryCarrie Betta Fish Tank Decorations Hideout – Triple Skull Hiding Cave for Aquarium, Resin Ornament with Artificial Moss Texture and Multiple Entrances for Shrimp, Small Fish – 7.3×4.9×6.1inch
Triple skull cave
9 entrances
Freshwater or saltwater
Pros
- Nine entrances
- Designed for small aquatic species
- Artificial moss texture
- Resin ornament
Cons
- Only 16 reviews
- Single ornament
The MaryCarrie cave stacks three skull forms into one hideout with nine stated openings. That gives a betta options for passing through or taking cover, while the artificial moss texture supplies the aged look that suits a Victorian wreck scene.
Its listed size is 7.3 by 4.9 by 6.1 inches, so it is more vertical than the relaqcc skeleton. The maker describes it as ready-to-use resin for freshwater and saltwater and specifically names bettas, shrimp, and small fish.
Its 4.9 average is based on 16 reviews, with review notes praising the unusual design and multiple hiding spaces. I would regard the review score as encouraging, while relying more on the stated footprint and entrance layout for a tank decision.
It fits an angled back-corner display
Turn the cave slightly toward the front so at least one entrance remains visible and the fish has a clear way out. A tall background plant behind it can make the skull group look like an abandoned engine room without taking over the foreground.
It favors a single betta over a packed community display
Many openings are useful, but they do not create more aquarium volume. In a modest tank, I would let this one ornament provide the hideout role and keep the rest of the scape low, soft, and easy to clean around.
4. The SMANTA Submarine Shipwreck builds a compact all-in-one scene
Aquarium Shipwreck Decor Set, Fish Tank Accessories Resin Submarine Ornament Betta Fish Hideout Cave with 6 Artificial Aquatic Plants, 40+ Seashells, 1 Floating Diver for Freshwater Saltwater
Submarine set
6 plants and shells
Weighted resin base
Pros
- Complete landscaping kit
- Hollow hideout
- Weighted base
- Non-toxic resin claim
Cons
- Only 10 reviews
- Compact 5.1 inch ornament
The SMANTA set begins with a submarine hideout and adds six artificial plants, more than 40 seashells, and a floating diver. A submarine is not literal steampunk, but its mechanical silhouette makes it one of the easiest ways to suggest a retro submersible workshop.
The main ornament measures 5.1 by 2.2 by 3.5 inches and has a weighted base. The listing also says its eco resin is non-toxic, odorless, non-fading, and will not alter pH; those are manufacturer claims, so I would still rinse it and observe the tank after placement.
This set has a 4.8 average from 10 reviews, with customers appreciating the completeness of the contents. Its small scale makes it a more realistic candidate for a 5-gallon betta tank than the 10-inch centerpiece options.
It fits a 5-gallon tank with restrained planting
Use the submarine as the hide, then select only some of the included plants and shells. I would not add every piece automatically, since the right amount of decor is the amount that leaves the betta open swimming space and straightforward access for cleaning.
It needs shells kept away from the main hide entrance
The supplied shells are decorative fill, not a reason to narrow a fish’s route in and out of the submarine. Arrange them in a loose border, avoid tiny trapping gaps, and remove any piece that proves hard to clean or shifts in the current.
5. The Xereooe Shipwreck and Diver makes a moving water-flow accent
6 Pcs Aquarium Decor Set Shipwreck Decoration Little Diver Floating Fish Tank Decoration Fish Tank Plants
Shipwreck and diver
4 plants
Smooth resin hull
Pros
- Smooth polished hull
- Four artificial plants
- Floating diver
- Non-toxic resin claim
Cons
- Plastic plants
- Compact 5.3 inch wreck
Xereooe pairs a 5.3-inch shipwreck with four plastic water-grass plants and a floating diver. The diver moves with water flow, which gives the display a small point of motion without needing a powered feature or a second large ornament.
The supplied data identifies a hand-painted resin wreck with a smooth polished hull and says it will not alter pH. For a steampunk fish tank, I would treat the diver as a whimsical explorer in a sunken mechanical vessel, not as a hideout itself.
The item has a 4.6 rating across 138 reviews, a useful volume of feedback for a compact set. Its customer insights point to good set value, while the product details make clear that the plant material is plastic rather than live foliage.
It fits tanks where the current is easy to observe
The floating diver can give a simple visual clue about water movement. That is helpful near, but not directly in, the filter’s flow path; the fish should still have a calmer area where it can rest near the surface.
It needs plant leaves checked before placement
The hull is described as smooth, but artificial plant leaves should get the same touch test as the ornament. If a leaf edge feels stiff or pointed, I would not place it where a long-finned betta is likely to brush past it.
6. The CousDUoBe Castle Set creates a full architectural background
CousDUoBe 9Pcs Resin Castle Decorations Set，Realistic Fish Tank Castle with Eco-Friendly Design,Fish Tank Decorations Aquarium Accessories
Castle plus 8 plants
7.1 inch depth
Non-toxic resin
Pros
- Castle and eight plants
- Resin material
- Stable construction
- Hidden corners and arches
Cons
- Limited color options
- Fixed dimensions
This CousDUoBe package combines a gray resin castle with eight aquarium plants. Castles lean more Victorian than mechanical, but the arches and hidden corners can become a convincing steampunk station when the colors around them stay subdued.
The listed castle dimensions are 7.1 by 3.9 by 5.9 inches and its weight is 0.56 kilograms. The manufacturer states the resin is non-toxic and does not affect pH, and the flat, stable construction is useful when a betta explores close to the substrate.
It has a 4.6 average from 116 reviews. The supplied drawbacks are limited color options and fixed dimensions, so I would choose it for the shape and scale first rather than expecting a flexible decorative piece.
It fits a layered castle-and-ruins composition
Set the castle toward the rear and use a small cave or low plant in front only if the front glass remains clear. This placement makes the arches feel like depth rather than a wall that divides the aquarium into cramped sections.
It needs plants used as accents rather than a thicket
Eight plants provide plenty of options, but all eight do not need to go in the same aquarium. I would place a few around the castle, retain spare pieces for later changes, and keep clear water flow around the filter intake.
7. The Ameliade Barrel Set fills small areas with foliage
Ameliade Fish Tank Accessories Decorations Set with Broken Barrel Cave & 11 Artificial Aquatic Plants – Betta Goldfish Hiding Spots for Aquariums, Small Bowl Ornament Decor
Broken barrel
11 artificial plants
Low maintenance
Pros
- Broken-barrel hideout
- Eleven plants
- Non-toxic material claim
- No trimming needed
Cons
- Plastic plants
- Plant heights vary
The Ameliade set contains a broken barrel and 11 artificial aquatic plants, for 12 pieces in total. A barrel reads more nautical than clockwork, but it works as background cargo alongside a submarine, shipwreck, or carefully chosen dark stones.
The barrel measures 5.2 by 3.2 by 3.5 inches, while the stated plant heights vary from 2 to 6.5 inches. The listing describes the materials as non-toxic, pH-neutral, and low maintenance because they need no lighting or trimming.
The 4.6 rating from 61 reviews gives this set a reasonable feedback base. I would choose it for someone who wants room to arrange plants around a small hide, not for someone seeking a single dramatic centerpiece.
It fits a planted foreground around one small hide
The barrel’s footprint can sit off-center with the taller plants used behind it. Leave enough bare substrate around the opening for the fish to see an exit and for you to siphon debris without dismantling the whole scene.
It needs softer foliage choices near resting areas
The listing calls the setup low maintenance, but artificial plants vary in feel. I prefer to reserve the softest-feeling leaves for places near the surface or heater where a betta may pause, then remove any piece that feels rough.
8. The relaqcc Ruins Vase Cave adds a low, three-hole hide
relaqcc Aquarium Decor Ruins Leaning Vase Hideaway Cave, Betta Fish Tank Accessories for Goldfish, Shrimp, Conch, Cichlid
Three swim through holes
Resin cave
10-15 minute pre-soak
Pros
- Three passage holes
- Resin construction
- Naturalistic ruins look
- Small-fish hideaway
Cons
- Single item
- Soak before first use
This relaqcc ruins cave uses a leaning-vase form rather than a ship or skull. Its worn, textured look makes a good supporting prop in a Victorian aquarium, especially when a larger mechanical-looking item already supplies the focal point.
The listing gives its usable dimensions as 5.1 by 4.7 by 4.7 inches and describes three holes for swimming through and hiding. It also directs owners to rinse and soak it for 10 to 15 minutes before use, a specific preparation instruction worth following.
It holds a 4.6 average across 51 reviews. I see its single-item package as a positive for controlled layouts: you can add one purpose-built hide without committing to a large bundle of plants or ornaments.
It fits a low-profile hide near a planted backdrop
The vase silhouette stays relatively low, so it can go in front of a taller silk-like plant or a shaded driftwood piece. Keep the three holes unblocked, since each one is part of the ornament’s appeal for a fish that likes a choice of routes.
It needs a rinse and a short pre-soak first
The seller’s rinse-and-soak direction is unusually clear, and I would follow it before the cave reaches aquarium water. After that, check the openings and watch the first few explorations rather than assuming every decorative passage is comfortable for a particular fish.
9. The AWXZOM Temple Mountain makes a large scenic statement
AWXZOM Extra Large Aquarium Decorations kit – “Ancient Temple in The Mountain”, Japanese Aquarium Decorations Resin Aquarium Castle Decorations Aquarium Mountain View Stone
Mountain and temple
11.2 inch long rock
Resin
Pros
- Large scenic scale
- Mountain and castle pieces
- Resin material
- Freshwater and saltwater claim
Cons
- Heavy 1.83 kg
- Too large for small tanks
The AWXZOM kit is a mountain-and-temple scene with an approximately 11.2 by 5.5 by 10.8 inch resin rock. It is not a natural match for classic Victorian machinery, yet its monumental ruin look can work in a steampunk aquascape built around an abandoned underground station.
At 1.83 kilograms, it is the heaviest item here and needs a stable, considered placement. The listing calls the resin eco-friendly, non-toxic, and suitable for freshwater and saltwater, but its physical size is the first factor I would consider.
It has a 4.5 rating from 97 reviews. The known limitations are direct: it may not fit smaller tanks and can be difficult to reposition, so this is not the pick for a simple 5-gallon betta tank.
It fits only a tank with generous swimming room
Measure the aquarium’s interior length, width, and height before choosing this piece, then account for substrate and equipment. A large scenic object belongs in an aquarium where the betta can still cross the tank without constantly detouring around it.
It needs placement before water and livestock
Because of its stated weight, I would decide its position during the initial dry layout and avoid repeated moves after the aquarium is set up. Confirm that it sits firmly and does not press against glass or create inaccessible debris traps.
10. The CousDUoBe Castle Bubbler supplies a mechanical movement point
CousDUoBe Aquarium Decor Castle Fish Tank Bubbler Set Aquarium Plants for Aquatic Pets to Breed Play and Rest Fish Decorations for Tank
Castle bubbler
7 plants
5 gallon and up
Pros
- Built-in bubbler feature
- Seven plants
- Soft plant leaves
- Stable flat base
Cons
- Air pump not included
- For 5 gallons and up
The CousDUoBe bubbler set combines a 7.5 by 3.6 by 5.6 inch castle with seven plants. Its air-driven effect can add the sense of pipes and machinery that many steampunk theme tank ideas need, provided the water movement is gentle enough for a betta.
The supplied listing says the resin does not affect pH, the plants have soft leaves, and the flat base helps prevent tipping. It also states that the air pump is not included and specifies tanks of 5 gallons or larger.
This set’s 4.5 rating comes from 52 reviews. I would only pick the bubbler feature if the aquarium already has appropriate air equipment and the fish has a quiet zone away from the rising bubbles.
It fits a 5-gallon-or-larger tank with calm water zones
Place the castle so the bubbles do not turn the whole aquarium into a high-flow corridor. Bettas often appreciate a place to rest, so the effect should be a localized visual detail rather than a current that follows the fish everywhere.
It needs compatible air equipment planned in advance
The ornament cannot create bubbles by itself because the required air pump is not included. Check the route for airline tubing during the dry layout, then keep tubing discreet so it supports the mechanical theme instead of visually cluttering it.
11. The SARDVISA Mini Floating Submarine is the small retro accent
SARDVISA 2.1 in Mini Floating Submarine Fish Tank Decoration, Safe Resin Aquarium Decoration for Betta Toys, Cichlid, Goldfish, Shrimps and Hermit Crabs, Cute Retro Underwater Fish Tank Accessories
2.1 inch floating submarine
13 foot thread
Resin
Pros
- Compact retro submarine
- Custom floating height
- 13-foot crystal thread
- Non-toxic resin claim
Cons
- Small in larger tanks
- Needs buoyancy adjustment
The SARDVISA submarine is a 2.1-inch mini resin ornament suspended by a 13-foot crystal thread and floating ball. It is the clearest retro-machine accent in this guide, and it can add vertical interest without using much of the substrate.
The listing says the floating height can be adjusted and that water filling helps with buoyancy control. I would treat it as an accent beside a true hideout, because its small size does not replace the shelter and resting functions of a cave or larger wreck.
Its 4.4 rating is based on 771 reviews, by far the largest review count in this roundup. Customer-review data is valuable here, but the setup still needs careful adjustment so the thread and float stay away from filter hardware.
It fits a sparse scene that needs one moving detail
This mini submarine belongs in a tank that already has an uncluttered layout. Position it where the fish has space below and beside it, and avoid placing it directly over a favorite resting leaf or the main entry to a cave.
It needs buoyancy tested before it shares the tank
Fill and adjust the ornament according to its instructions in a separate container of conditioned water if possible. I would test its height and thread path first, then introduce it only when it will not bump glass, snag equipment, or obstruct the surface.
12. The GOLOMOZ Vintage Airplane Ruins offers a compact wreck hideout
GOLOMOZ Fighter Vintage Airplane Ruins – Hiding Place for Betta,Shrimp,Goldfish & Reptiles,Submarine Landscape Shelter Cave Hideouts Aquarium Accessories Small Fish Tank Decor for 2-10 Gallon Tank
Vintage plane wreck
Four hideout holes
2 to 10 gallon tanks
Pros
- Vintage aircraft appearance
- Four hideout holes
- Resin construction
- Flat stable base
Cons
- Only 11 reviews
- Handle with care
The GOLOMOZ vintage airplane wreck measures 8.6 by 3.6 by 2.8 inches and has four small holes for bettas, shrimp, and other small animals. An aircraft ruin is a useful alternative to a submarine when the intended look is an abandoned inventor’s workshop rather than a deep-sea scene.
The listing describes handmade resin, a sturdy stable base, and simple cleaning. It also advises careful handling because the material can be fragile, which is a fair tradeoff to consider for an ornament with thin-looking wreckage details.
This product has a 4.3 rating from 11 reviews, the smallest confidence signal in the lineup. I would view it as a stylistic specialist for a narrow 2- to 10-gallon tank, not as the all-purpose first choice.
It fits a long, low wreck scene in a small aquarium
The low 2.8-inch height can leave open water above the ornament, which is useful in a tank where a betta visits the surface frequently. Check the 8.6-inch length against the interior footprint, particularly in small tanks with a heater or filter.
It needs gentle handling and a full edge check
A vintage wreck can look convincing because of broken lines, but those same lines need inspection before a fish encounters them. Rinse it gently, touch each opening and edge, and do not use it if any section feels sharp, cracked, or unstable.
The right buying guide begins with smooth, aquarium-ready materials
The best tank decor for bettas is smooth, non-toxic, correctly sized aquarium decor that gives the fish a hideout and resting space while leaving clear swimming room. For a steampunk look, choose resin pieces with aged-ship, ruin, submarine, or castle forms, then keep real metal and loose mechanical parts out of the water.
Forum discussions repeatedly point to fin tears from sharp edges, rust from metal decorations, and dangerous gaps that trap fish. That matches the practical rule I use for every theme: a decoration is only worth keeping when it looks good, stays stable, is easy to clean, and lets the betta enter and exit freely.
It starts with five checks before decor goes underwater
Check the material: Favor ornaments sold as aquarium resin and follow any rinse or pre-soak instructions. Do not put uncoated brass, copper, unknown metal gears, painted craft parts, or rusty objects in the aquarium.
Check every edge: Feel openings, seams, plant leaves, and decorative points with a soft cloth or stocking. Remove anything that snags, feels rough, or has a chip.
Check each opening: The fish needs to turn around and exit without squeezing through a narrow gap. Decorative windows and artificial barrels can become a problem when the opening is too small for the individual fish.
Check the footprint: Use the listed dimensions and leave swimming lanes, heater clearance, and access to the filter. A large ornament can be wrong for a small tank even when its material is appropriate.
Check stability: Put each piece on a level substrate area and confirm it cannot tip. Heavy scenery should be positioned before filling the aquarium, not shoved into place around a fish.
It keeps the steampunk look outside the metal itself
Brass aquarium decor can be visually tempting, but brass-style color is not the same as placing brass in water. The safer approach is to create the impression with brown and gray resin, weathered textures, dark gravel, ceramic-colored ruins, and a controlled amount of green foliage.
Copper-free aquarium decor is the sensible standard for a betta setup. I would never use loose gears, exposed wire, corroded keys, old clock parts, or DIY pieces coated with an unverified adhesive, even if they would look perfect in a Victorian aquarium style.
It uses plants and wood to soften a mechanical scene
Live plants and smooth driftwood are common recommendations from experienced fish keepers because they add cover without making a tank feel like a plastic display. A dark piece of aquarium-ready driftwood can look like a broken beam from a ship or workshop, while live foliage can soften the hard outlines of resin.
If artificial plants are part of a set, inspect them as closely as the main ornament. Use a small number of soft leaves around a cave entrance and leave the surface clear enough for bubble nesting and easy feeding.
It matches the ornament to the tank before the theme
For a 5-gallon betta tank, compact pieces such as the SMANTA submarine, Xereooe shipwreck, Ameliade barrel, relaqcc vase cave, or a carefully placed mini submarine make more sense than an oversized mountain. A small tank needs open water first and a theme second.
For a 10-gallon steampunk setup, the large pirate ship, skull skeleton, triple skull cave, or castle can become the focal point if the rest of the arrangement stays sparse. Bigger tanks offer more room for a layered scene, but they still need a route around every ornament.
It treats DIY ideas as display-only unless materials are verified
DIY steampunk betta tank decorations are safest when the true mechanical props stay outside the aquarium. Place gears, a pocket-watch case, or brass-colored accents around the tank exterior, then repeat the color palette underwater with verified aquarium resin and smooth natural materials.
A PVC pipe covered with a smooth, aquarium-appropriate surface is sometimes mentioned as a lower-cost hideout idea by hobbyists. I would only consider it after confirming the material is aquarium appropriate, making the edges smooth, and avoiding unknown paints, glues, and metal fasteners.
It stays clean through simple, regular maintenance
During normal water changes, lift one ornament at a time if debris collects under it and rinse it in removed aquarium water rather than soap. Watch for flaking paint, cracks, changed texture, or trapped waste, because a theme is easier to enjoy when the water remains easy to maintain.
After adding any new piece, observe the betta’s movement and resting behavior for the next several days. If the fish avoids an opening, catches a fin, struggles with current around an ornament, or loses access to the surface, simplify the layout immediately.
FAQ
The answers below cover common betta decor questions
What is the best tank decor for bettas?
The best tank decor for bettas is smooth, aquarium-ready material with a correctly sized hideout, clear swimming space, and no sharp edges or trapping gaps. Resin caves, smooth driftwood, soft foliage, and stable ornaments can work when they are rinsed, inspected, and sized for the aquarium.
Do betta fish like decorations in their tank?
Bettas can benefit from a calm, enriched tank with places to hide, rest, and explore. Decorations should not crowd the aquarium or create harsh current; keep an open route to the surface and choose smooth pieces that the fish can pass safely.
What not to put in a betta tank?
Do not put uncoated metal, copper, brass, rusting objects, sharp ornaments, unknown painted craft items, or decor with restrictive gaps in a betta tank. Avoid soap when cleaning ornaments, and remove any piece that snags a soft cloth, flakes, cracks, or destabilizes the aquarium layout.
What kind of tank decor do bettas like?
Bettas generally benefit from smooth hiding places, gentle resting areas, open swimming lanes, and plant cover. A cave, shipwreck, or resin ruin can fit a steampunk theme if it is aquarium-ready, stable, appropriately sized, and has openings wide enough for the individual fish to enter and leave freely.
The best final choice is the one that leaves your betta room to move
For a large centerpiece, I would start with the XXYOUPIN pirate ship; for a compact themed bundle, the SMANTA submarine is easier to scale; and for one moving accent, the SARDVISA submarine has the deepest review history. The best steampunk aquarium decor sets for betta tanks in 2026 still follow one rule: use the theme to frame a healthy habitat, never to crowd it.
Measure first, rinse and inspect every piece, and introduce only what the aquarium can comfortably hold. A less crowded scene with one reliable hideout will look more intentional and give your betta a better place to live.