Quick answer: a natural-look betta tank that is also safe has a heated, filtered tank of at least 20 litres held at 24–26 °C, a lid with an air gap above the water, gentle flow, smooth sand or fine gravel, plenty of live or soft artificial plants, and smooth-edged caves or hides. Leave out anything sharp or rough that could tear long fins, and never add a mirror. Get the tank cycled before your betta goes in.
Betta tanks don’t need neon gravel or plastic castles to shine. In fact, the best homes for your betta are the ones that mimic nature while still turning heads. Here’s how to style a natural-looking tank that’s both beautiful and safe.
Looking for safe caves for shrimp, bettas and plecos? Explore our UK-made Aquarium Caves Collection here →
✅ Start with a Soft Base
Use sand or fine gravel that won’t damage delicate fins. Look for earthy tones that match your fish’s natural habitat.
✅ Add Levels with Substrate Cliffs
Our substrate cliffs create gentle height differences, perfect for territorial bettas or shrimp who love to explore. They double as viewing perches and hideaways.
✅ Incorporate Hides and Shelters
Caves and tunnels are more than decor. They reduce stress and give your betta a place to retreat. Our designs are smooth-edged and shrimp-safe.
✅ Float Something Fun
BettaPod floating hide for gentle surface rest, or a mushroom ledge mid-water perch — resting spots without cluttering the floor.
✅ Go Green (or Fake Green)
Live plants are ideal, but silk alternatives work too. Just skip anything with sharp edges or wire stems.
Natural doesn’t mean boring. With a few clever choices, your tank can be both safe and stunning. Explore our aquarium decor for more ways to upgrade your fish’s world.
Natural betta set-up checklist
| Element | What to aim for | Source |
|---|---|---|
| Tank size | 20 litres or more for one betta; 10 litres is the absolute minimum. Bowls are too small | RSPCA; OATA |
| Heating | A submersible heater holding 24–26 °C. Room temperature is too cold. OATA gives a wider 20–28 °C range | RSPCA; OATA |
| Lid and air gap | Bettas jump, so fit a lid, and leave space above the water because they take air at the surface | RSPCA; OATA |
| Filter and flow | A filter is essential; choose adjustable, low flow, because bettas prefer slow water | RSPCA; OATA |
| Substrate | Aquarium sand or smooth gravel | OATA; RSPCA |
| Plants | Ideally live plants, or silk or aquarium-shop plastic plants without rough edges. Tall plants with large leaves give a resting spot near the surface | RSPCA; OATA |
| Hides | Caves, pots or other shelter with smooth edges | OATA; RSPCA |
| Cover | At least one covered side, so the fish isn't exposed to bare glass all round | RSPCA |
| Light | Lights on for no more than 10 hours a day, with at least 8 hours of darkness | RSPCA |
Step by step: building the tank
- Place the tank away from draughts, heat sources and direct sunlight. OATA also advises avoiding loud noise and vibration.
- Add the substrate: rinsed aquarium sand or smooth, fine gravel.
- Build the hardscape: stones, wood, cliffs and caves. Run your fingers over every piece first. The RSPCA notes that sharp points on décor and driftwood can be sanded gently to make them safe.
- Plant it: taller plants at the back and sides, broad leaves near the surface, and open water at the front for swimming.
- Fit the filter, heater and lid, and set the flow low.
- Fill and cycle: treat tap water with conditioner, then let the filter mature until ammonia and nitrite read zero before adding fish (OATA).
- Add the betta, then test the water weekly and change around 25% each week (OATA; the RSPCA suggests 10–25%).
What to leave out
- Sharp or rough ornaments and plants: long fins tear easily, especially on males.
- Mirrors: the RSPCA warns that a male betta sees a rival and flares constantly, which causes stress and exhaustion.
- Plants collected from the wild: they can carry parasites or disease. Buy from an aquarium shop.
- Décor that fills the surface: keep clear surface water so your betta can always reach the air.
- Soap or detergent on anything that goes in the tank.
For more on choosing shelter, see the complete guide to aquarium caves, the best hiding spots for aquarium fish and why floating caves suit bettas.
Frequently asked questions
What size tank does a betta need for a natural set-up?
At least 20 litres for one betta, with 10 litres as the absolute minimum, according to the RSPCA. OATA also recommends at least 20 litres for a single male and 60 litres for a group of females. A bigger tank gives more room for plants and hardscape, and stays more stable.
Are silk or plastic plants safe for bettas?
They can be. The RSPCA names silk or live plants and says neither should have rough edges, and advises using only plastic plants bought from an aquarium shop. Whatever you choose, check it for sharp or rough edges before it goes in.
Is sand or gravel better for a betta tank?
Either works. OATA lists aquarium gravel or sand, and the RSPCA says gravel should be smooth so it can't damage fins.
Do bettas need hides and caves?
Yes. Bettas come from densely planted water, and the RSPCA says plants and other cover to explore, rest and hide in reduce stress. A betta that hides all the time, though, may be stressed or ill.
Can I put a mirror in my betta tank?
No. The RSPCA says mirrors make males flare their fins constantly at what they see as a rival, causing stress and exhaustion.
What temperature should a betta tank be?
24–26 °C, kept steady with a submersible heater (RSPCA). OATA's suggested range is 20–28 °C.
Sources
- RSPCA Knowledgebase: How should I care for my Siamese fighting fish?
- OATA: How to look after Siamese fighting fish (bettas)
Care figures checked against the sources above on 27 October 2026.