Betta fish need a tank of at least 5 gallons, a heater to keep water between 76 and 82 degrees Fahrenheit, a gentle filter, a light, and a lid. That's the core equipment list. A lot of bettas are sold with "complete" kits that include a tiny bowl or under-gallon cup, but those setups are genuinely too small for a healthy betta and lead to shortened lifespans and chronic health problems. Get the right equipment from the start and you'll have a betta that lives 3-5 years instead of the 6-12 months that poor setup typically produces.
This guide covers every piece of equipment a betta needs, which specific products work well, what to skip, and how to put it all together without overcomplicating things. Betta keeping is straightforward once you have the right gear.
The Tank: Minimum Size and What Shapes to Avoid
Five gallons is the realistic minimum for a single betta. Ten gallons is better. Anything smaller makes water quality management genuinely difficult. Small volumes of water experience temperature swings faster, ammonia spikes faster, and require much more frequent water changes to stay clean.
Tank Shape Matters for Bettas
Bettas are labyrinth fish, meaning they breathe atmospheric air at the surface. They need easy access to the surface, which makes tanks with a lot of depth relative to their footprint less ideal than tanks with more horizontal surface area.
Tall, narrow tanks (sometimes called "portrait" tanks) are popular aesthetically but not ideal for bettas. A standard 10-gallon rectangle (20" x 10" x 12") is much better than a 10-gallon tall. The Aqueon 10-gallon standard, the Marineland 5-gallon Portrait, and the Fluval Spec V (5.5 gallons) are all commonly used betta tanks. The Fluval Spec V is attractive and comes with a light and filter built in, though the filter flow needs to be reduced (more on that in a moment).
Kits vs. Standalone Tanks
Starter kits from Aqueon, Marina, and Fluval often include a light and a filter. This is convenient, but pay attention to what's included. The light included in cheap kits is sometimes barely functional, and the filter may have a flow rate that's too strong for a single betta. Still, kits like the Aqueon 10-gallon LED Kit or the Marina LED Aquarium Kit provide reasonable starting points if you plan to upgrade the filter.
Heater: The Equipment Bettas Need Most
Bettas are tropical fish from Southeast Asia. They need warm water, consistently, or their immune system weakens and they become susceptible to ich, fin rot, and bacterial infections.
The target range is 76-82°F. Room temperature in most homes (68-72°F) is too cold for a betta to thrive. A quality adjustable heater is not optional if you live anywhere with normal climate control.
Heater Recommendations by Tank Size
For 5-gallon tanks, a 25-watt adjustable heater is the right size. The Aqueon Pro 25W and Cobalt Aquatics Neo-Therm 25W are both reliable options. The Cobalt Neo-Therm is particularly well-regarded for accurate temperature control with less than 1°F variance.
For 10-gallon tanks, step up to a 50-watt heater. The Eheim Jager 50W is one of the most consistently accurate heaters available at its price point, and Eheim has a reputation for decades of reliability. The Aqueon Pro 50W is also solid.
One heater problem I see constantly: cheap heaters that stick in the "on" position and cook the fish. Paying $25-35 for a quality heater is genuinely worth it. A dead betta and the emotional loss that comes with it is not worth saving $10 upfront.
Always use an aquarium thermometer (even a simple suction-cup stick thermometer like the Marina Floating Thermometer) to verify your heater is actually hitting the right temperature rather than trusting the heater's dial alone.
Filter: Flow Rate Is the Key Issue for Bettas
Bettas come from slow-moving water in rice paddies and shallow ponds. Their long fins are not designed for swimming against a strong current. A filter with high flow creates constant water movement that exhausts bettas, stresses them, and can cause fin damage as they fight the current.
This does not mean bettas don't need filtration. They absolutely do. The goal is gentle, effective filtration.
Filter Types That Work for Bettas
Sponge filters are excellent for betta tanks. They produce almost no current, provide excellent biological filtration, and are easy to maintain. An air pump like the Tetra Whisper AP-10 drives the sponge filter. The Hikari Bacto-Surge Sponge Filter and the Aquaneat Aquarium Bio Sponge Filter both work well in 5-10 gallon tanks.
Internal power filters with adjustable flow work if you can dial down the flow rate. The Aqueon QuietFlow E Internal Power Filter has a baffle option and can be reduced to a gentle output.
HOB (hang-on-back) filters with baffled output can work for bettas if you add a pre-filter sponge to reduce flow velocity. The AquaClear 20 with a sponge over the intake and output baffled with a small piece of sponge or a plastic bottle cap trick is a popular setup in the betta community.
The Fluval Spec V's built-in filter has a reputation for being too strong for bettas without modification. The easiest fix is stuffing a small piece of filter sponge into the outlet to diffuse the flow.
Lighting: How Much and What Kind
Bettas don't have extreme light demands, but they do need a regular light cycle to maintain their circadian rhythm. 8-10 hours of light per day is ideal. More than 12 hours promotes algae and can stress fish.
A basic LED light like the Nicrew ClassicLED or any included tank kit light works fine for a betta-only tank. If you want to grow plants with your betta (which is a great idea since plants provide cover and use up nitrates), step up to something with a bit more output.
Bettas actually benefit from live plants. Java fern, Anubias, water wisteria, and Amazon swords all grow well in betta tanks with minimal light. Adding a cheap outlet timer to automate the light cycle removes the need to remember to turn it on and off.
For a broader look at aquarium lighting and equipment choices, see our best aquarium equipment guide.
Substrate, Decor, and Hides
Gravel or sand both work for betta tanks. Fine gravel (like Caribsea Super Naturals) is easy to clean with a gravel vacuum during water changes. Bare-bottom tanks are easier to maintain but look stark.
Bettas need hiding spots. A tank with no cover or shelter produces chronically stressed fish. Indian almond leaves (also called Catappa leaves) are fantastic additions because they soften water chemistry, release tannins that replicate natural betta habitat, and provide cover. Silk or live plants work better than plastic plants with sharp edges, which can tear betta fins.
The Nitrogen Cycle: Equipment Won't Help Without This Step
This is where new betta keepers go wrong most often, and no amount of good equipment fixes a tank that hasn't been cycled.
The nitrogen cycle establishes beneficial bacteria colonies in your filter media that convert toxic ammonia (from fish waste) into nitrite (still toxic) and then into nitrate (much less harmful). This process takes 4-6 weeks in a new tank. During that time, ammonia and nitrite spikes can kill fish rapidly.
To speed up the cycle before adding your betta, use a bottled bacteria product like Tetra SafeStart Plus or Seachem Stability along with pure ammonia or an ammonia source. Test your water with an API Freshwater Master Test Kit (not strips, which are inaccurate) until you can confirm ammonia and nitrite both read 0 and nitrate reads above 0. That tells you the cycle is complete.
Some hobbyists add bettas to uncycled tanks and do daily water changes to keep ammonia below 0.25 ppm while the cycle establishes. This is called a "fish-in cycle" and works, but requires daily testing and water changes for 4-6 weeks.
Water Conditioner and Chemistry
Every time you add tap water to your betta tank, you need to neutralize chlorine and chloramine first. These disinfectants are lethal to fish and beneficial bacteria.
Seachem Prime is the gold standard water conditioner. One bottle treats a lot of water and it also detoxifies ammonia temporarily, which is useful during cycling. API Stress Coat is another solid option.
For water chemistry, bettas are flexible. They do fine in water with a pH of 6.5-7.5 and moderate hardness. Unless your tap water is extremely acidic (below 6.0) or extremely alkaline (above 8.0), you likely don't need to adjust pH. Test your tap water with the API Master Test Kit and only adjust if genuinely necessary.
Check out our top aquarium equipment roundup for current picks on water testing kits and conditioners.
FAQ
What size tank does a betta fish actually need?
The minimum is 5 gallons. Ten gallons is better and makes water quality maintenance noticeably easier. Tanks under 2.5 gallons are too small to maintain stable water parameters and will significantly shorten your betta's lifespan. The common "betta bowl" or 1-gallon "betta tank" sold at pet stores does not provide adequate living conditions.
Do bettas need a heater?
Yes, unless you live somewhere where your home never drops below 76°F. Bettas are tropical fish that need water temperatures between 76 and 82°F. Room temperature in most homes is too cold. A good 25W heater for a 5-gallon tank costs $15-25 and is one of the most important things you can buy.
Do bettas need a filter?
Yes. The idea that bettas don't need filters is a persistent myth. Without filtration, ammonia from fish waste accumulates to toxic levels. The key for bettas is choosing a filter with low, gentle flow, since their long fins are not suited to strong currents. Sponge filters are ideal.
Can I put a betta with other fish?
Sometimes. Bettas do well with peaceful, non-nippery tank mates in tanks 10 gallons or larger. Good companions include ember tetras, pygmy corydoras, snails (like nerite snails), and small rasboras. Avoid any fish with long, colorful fins (which bettas may attack), aggressive fish, and other bettas. Two male bettas will fight to the death.
What the Betta Setup Checklist Looks Like
Once you have the right equipment, setting up a betta tank is a half-hour project. Fill the tank, add dechlorinated water, install the heater and filter, run the tank through the nitrogen cycle, and add your betta when parameters are stable. After that, the routine is weekly 20-25% water changes, feeding once or twice daily, and checking temperature every few days.
The equipment is simple. The knowledge gap is the main barrier for most new betta keepers. Start with a 10-gallon tank, a reliable 50W heater like the Eheim Jager, a sponge filter, and an API Master Test Kit. That combination gives your betta a real chance at a full, healthy lifespan.