Setting up a planted betta community tank
Edited by Marin Hale · Every section cites its sources below it
A betta can share a planted tank with a few calm companions, but the setup matters more than the fish list. Get the tank size, warmth, gentle flow and cycling right first. Then add animals slowly, with a plan for separating them if things go wrong.
- One betta alone needs 5 gallons or more, a betta with one small group of calm companions works from 10 gallons, and a fuller community needs 20 gallons or more.
- Use a heater set to about 78°F, a low-flow filter, a secure lid and soft plants, and give the betta somewhere to hide.
- Cycle the tank first, and check readiness with the 'Is your tank ready for fish?' section rather than a zero reading alone.
- Add animals slowly, and separate fish immediately at any injury or repeated chasing.
- Feed lightly, change about 20% of the water weekly, and keep testing as you add fish.
Choose the right tank size
Size depends on who lives in the tank. One betta alone needs at least 5 gallons. A betta plus one small group of calm companions works from 10 gallons. A fuller community with several kinds of companions needs 20 gallons or more.
Extra space gives everyone room to swim and lets other fish get away if the betta becomes pushy. Bettas do survive in bowls and vases, but they don't prefer tiny spaces. Skip those.
Which companions suit your tank is covered elsewhere on this site.
Sources for this section
[4] thetyedyediguana.com: “A single betta alone needs at least 5 gallons, but community setups require significantly more room.”
[4] thetyedyediguana.com: “The extra space reduces territorial aggression and gives tank mates room to escape if the betta becomes confrontational.”
[1] aquariumcoop.com: “Pick one bullet point from each subcategory below to put together your ideal community tank:”
[2] aqueon.com: “But they don't prefer tiny spaces.”
Heater, filter, lid and lights
Bettas are sensitive to temperature, so use a heater. Set it to about 78°F, which sits inside the 76 to 81°F range. A thermometer lets you check that the water has actually warmed.
Choose a low-flow filter. Strong currents can hurt a betta's fragile fins, and gentle flow is easier on them. A coarse filter sponge works well. Squeeze it out in a bucket of tank water about once a month so it doesn't clog.
Fit a secure lid, because bettas can jump out without one.
Give the tank a day and night. Run the lights for about 6 to 8 hours a day, a little longer if you have plants. A smart plug makes this easy.
Sources for this section
[2] aqueon.com: “you'll need a heater that keeps the water at about 76 to 81° Fahrenheit.”
[3] bettabotanicals.com: “make sure your heater is set to 78F, and your filter is up and running”
[2] aqueon.com: “Look for a low-flow filter. Strong currents might hurt your fish's fragile fins, and a low-flow filter will provide gentle currents your betta will enjoy.”
[3] bettabotanicals.com: “Purchase a course filter sponge and cut it to the dimensions of your filter.”
[2] aqueon.com: “Betta can unintentionally jump out of a tank without a cover.”
[2] aqueon.com: “Betta fish prefer day-night cycles just like you do, so turn off the lights at night.”
[3] bettabotanicals.com: “Run your lights for 6-8 hrs when you’re home, and maybe longer if you have plants”
Set up the tank, substrate and water
Put the tank on a level surface and fill it with water. Leave it for 24 hours to check that it doesn't leak. This matters most if the tank is second-hand or was shipped to you.
Then drain it and add your substrate. Gravel, fine sand and planted-tank aquasoil all work, so pick what suits your plants. Refill the tank and add water conditioner, which removes the toxic chemicals in tap water.
- Fill the tank on a level surface and let it sit for 24 hours to check for leaks.
- Drain it and lay your substrate.
- Refill the tank and add water conditioner.
- Turn on the heater and filter.
Sources for this section
[3] bettabotanicals.com: “Fill up your aquarium with water on a level surface, and let sit for 24 hrs.”
[3] bettabotanicals.com: “Substrate is a personal choice, but could range from rainbow gravel, to fine sand, a sedimented substrate, to an aquasoil for a planted aquarium.”
[3] bettabotanicals.com: “Remember, don’t forget your water conditioner. This removes toxic chemicals in your tap water.”
Plants and hardscape
For a 10-gallon tank, start with about 6 plants. Put short ones in front, medium ones in the middle and tall ones at the back so you can see them all. Most easy plants do fine in low light.
Choose soft plants for a betta. Anubias, hornwort and Naja grass are good choices. Avoid live or artificial plants with sharp or pointy edges, which can tear fins. If you use artificial plants, pick betta-safe silk.
Add hiding places too. A cave with a large entrance that won't snag fins is a good choice, and a betta hammock gives your fish somewhere to rest. A piece of driftwood works as well. It also helps cycling if it comes from an established tank.
Sources for this section
[1] aquariumcoop.com: “we suggest starting with approximately 6 aquatic plants to help beautify the fish tank, purify the water from toxic waste chemicals, and provide enrichment for the animals.”
[1] aquariumcoop.com: “pick some short plants to put in the foreground of the tank, slightly bigger plants for the midground, and tall plants for the background.”
[1] aquariumcoop.com: “Most of the choices below are for low light tanks”
[2] aqueon.com: “steer clear of artificial or live plants with sharp or pointy edges that can tear your betta's fins.”
[2] aqueon.com: “Anubias is one good variety. Hornwort and Naja grass are also nice choices.”
[2] aqueon.com: “A cave with a large entrance that doesn't snag your betta's fins is a nice choice.”
[3] bettabotanicals.com: “Ask your friend who has an established aquarium for a piece of driftwood, a bit of filter media, a bit of gravel”
Cycle the tank before the animals arrive
Cycling builds the beneficial bacteria, and the plants, that process fish waste. Skipping it puts your fish at risk. Expect it to take anywhere from 2 to 6 weeks, depending on your method. Warm water and a running filter help. Adding used filter media or substrate from an established tank, or a bacteria additive, speeds it up.
Zero ammonia and zero nitrite only prove the tank is ready if it has had a waste source to process. The site has one readiness procedure. In a fishless cycle, the tank is ready when a full ammonia dose reads 0 ammonia, 0 nitrite and some nitrate after 24 hours. In a planted tank, it is ready when the plants show new growth. With fish-in cycling, start with a few fish, feed very lightly and increase over 4 to 6 weeks.
Fishless cycling is easy to get wrong, so many beginners find the planted or fish-in route simpler. Whichever you pick, see the 'Is your tank ready for fish?' section on this page for the full procedure.
Sources for this section
[3] bettabotanicals.com: “Developing bacteria to process ammonia can take anywhere from 2‑6 weeks, depending on your method.”
[3] bettabotanicals.com: “Bacterial colonization happens best in warm temps”
[5] aquariumcoop.com: “simply transfer some used filter media or substrate from an established fish tank to your new one.”
[5] aquariumcoop.com: “Once the plants (or algae) show new growth, the cycle is complete.”
[5] aquariumcoop.com: “Feed your fish very lightly at first and then gradually increase the amount over the next four to six weeks.”
Adding animals in the right order
Once the tank is ready, add animals slowly and in stages. The first residents should be simple and hardy.
Many companion fish live in groups and must be added several at a time. Add the next batch only after the tank has coped with the last. Test the water between additions so the bacteria keep up with the extra waste.
One method for a male betta is to keep him in a breeding box while the others settle in for a few days, then release him. It isn't failproof, so keep watching.
Check on the tank more often than usual after each addition. If you see any injury or repeated chasing, separate the fish immediately. Don't wait to see if it settles. Keep a spare tank or container ready before you add anyone.
Sources for this section
[3] bettabotanicals.com: “The first forms of life you add should be something simple and hardy.”
[4] thetyedyediguana.com: “many fish that pair well with a betta, such as tetras, live in groups and must be added several at a time.”
[5] aquariumcoop.com: “you can begin slowly adding more fish, with some wait time in between”
[4] thetyedyediguana.com: “put the betta fish in a breeding box while adding new fish. Allow the other fish to acclimate to the tank for a few days. Then release the betta after the other fish are established.”
[4] thetyedyediguana.com: “Each time that you add new fish to the betta aquarium, monitor the tank more often than you normally would to watch for aggression.”
[4] thetyedyediguana.com: “If the fish can’t live peacefully together, remove them to a separate tank.”
[4] thetyedyediguana.com: “Always have a backup plan to separate if aggression occurs.”
Feeding
Feed only what your fish eat in about 60 seconds. Use a proper betta food for the betta.
Go lighter while the tank is new. The bacteria grow with the fish you add, but not overnight, so extra food just becomes extra waste.
Sources for this section
[3] bettabotanicals.com: “feeding only what your fish eats in 60 seconds, and being patient.”
[2] aqueon.com: “Look for soft plants, low-current filters, a large tank with lights on a day-night cycle, and special betta food.”
[3] bettabotanicals.com: “The bacteria you cultivated in the beginning will grow with the livestock you add, but not overnight.”
Weekly and monthly maintenance
Pick one day a week for a water change of about 20%, and always add conditioner. Test the water regularly, especially in the first weeks and after adding fish.
If you see ammonia or nitrite above 0.2 ppm, do a partial water change right away. If nitrate climbs above 40 ppm, change water to bring it down.
Once a month, squeeze out the filter sponge in a bucket of old tank water. Check on the tank often, and watch the betta and its companions for signs of fighting.
Sources for this section
[3] bettabotanicals.com: “Water changes. Every week (ish). About 20%( ish).”
[5] aquariumcoop.com: “Whenever you see a detectable amount of ammonia or nitrite (anything above 0.2 ppm), do a partial water change”
[5] aquariumcoop.com: “once it rises to concentrations more than 40 ppm, you know it’s time to do a water change to lower the nitrate levels.”
[3] bettabotanicals.com: “Once per month, squeeze it out into your water change bucket to ensure it doesn't get too clogged.”
[4] thetyedyediguana.com: “Always keep an eye on betta community tanks to make sure there’s enough space for the number of fish without territory fights.”
Is your tank ready for fish?
Zero ammonia and nitrite on a test only proves the tank is ready if something has been producing waste for the bacteria or plants to process. A tank that has just been sitting there with no fish, no food and no ammonia will read zero simply because there's nothing to break down. Use the route that matches your tank:
| Your tank | Ready when… |
|---|---|
| Fishless cycle (you add ammonia or fish food) | The tank turns a full dose of ammonia into nothing within a day: 24 hours after dosing, ammonia and nitrite read zero and nitrate is present. Keep adding the ammonia source until the fish go in, or the bacteria starve. |
| Planted tank (plants do the work) | The plants are visibly growing: new leaves and roots show they're using up the waste. Plant heavily and give them good light, substrate and fertilizer first. |
| You already have fish (fish-in cycle) | There's no single ready day. Start with only a few fish, feed very lightly, and increase food gradually over four to six weeks while testing often. |
Then: Whichever route you used, add fish a few at a time, feed sparingly, and test every few days for the first weeks: ammonia and nitrite should stay at 0 ppm and nitrate below 40 ppm. If ammonia or nitrite show up, stop adding fish, feed less and do a partial water change.
Sources for this procedure
freshwatersystems.com: “If ammonia levels are undetectable after 24 hours, nitrites are undetectable, and nitrates are present, the tank has completed its cycle.”
buceplant.com: “You can expect it to take anywhere from a few weeks to a few months to fully cycle a new tank”
aquariumcoop.com: “Once the plants (or algae) show new growth, the cycle is complete.”
aquariumcoop.com: “Feed your fish very lightly at first and then gradually increase the amount over the next four to six weeks.”
aquariumcoop.com: “Gradually add a few fish, feed them sparingly, and use water test strips to ensure that ammonia and nitrites are at 0 ppm and nitrates are below 40 ppm.”
This is the same procedure on every page of this site.
Next steps
Sources
- Cookie Cutter Setups for 10-Gallon Freshwater Aquariums (www.aquariumcoop.com)
- Betta Fish Tank Setup (www.aqueon.com)
- How to Set Up and Cycling a New Betta Aquarium (bettabotanicals.com)
- Betta Community Tank: Best Tankmates and Setup Guide (thetyedyediguana.com)
- Aquarium Cycling (Aquarium Co-op) (www.aquariumcoop.com)