Bettas (Betta splendens) are intelligent, interactive fish with huge personalities. They are often sold as fish that can live in a small bowl, but a betta in a heated, filtered tank lives longer, shows brighter color and keeps its fins in better shape.
| Adult size | About 2.5–3 inches |
|---|---|
| Minimum tank | 5 gallons, heated and filtered |
| Temperature | 78–82°F |
| pH | 6.5–7.5 |
| Lifespan | 3–5 years |
| Temperament | Males are aggressive toward other male bettas |
The setup
- Tank: 5 gallons or more. Larger tanks hold temperature and water quality more steadily. A ready-made betta fish and aquarium kit makes this easy.
- Heater: essential. Bettas are tropical fish, and cool water weakens their immune system.
- Filter with gentle flow: long-finned bettas struggle in strong current.
- Lid: bettas can jump.
- Soft decor and plants: silk or live plants, and a leaf hammock near the surface. Avoid sharp plastic plants that tear fins.
Feeding
Bettas are carnivores with small stomachs. Feed 2–4 quality pellets once or twice a day, such as New Life Spectrum Betta pellets or Fluval Bug Bites Betta Formula. Add frozen bloodworms or brine shrimp as an occasional treat. Many keepers skip one day a week to prevent bloating.
Water care
Change 20–30% of the water weekly (more often in small tanks), always with dechlorinated water at the same temperature. Never replace all the water at once, since that removes the beneficial bacteria in the tank.
Tankmates
- Never keep two male bettas together.
- In 10+ gallons, many bettas live peacefully with snails, corydoras, otocinclus or small schooling fish that don't nip fins.
- Avoid fin-nippers like tiger barbs and brightly colored, long-finned fish like fancy guppies that may be mistaken for a rival.
- Every betta is an individual. Always have a backup plan if yours turns out to be aggressive.
Normal behavior vs. warning signs
- Normal: building bubble nests, flaring at reflections, resting on leaves, coming to the surface to breathe air (they have a labyrinth organ).
- Warning signs: clamped fins, ragged or blackened fin edges (fin rot), white spots (ich), a swollen body or lying on the bottom for long periods. Most of these start with water quality, so test and change water first.
Frequently asked questions
Can a betta live in a bowl?
It can survive, but not thrive. Unheated, unfiltered bowls lead to stress, poor color and shorter lives. A heated, filtered 5-gallon tank is a much better minimum.
How long can a betta go without food?
Healthy adults can safely go a few days. For longer trips, ask someone to feed small portions rather than using large vacation feeders.
Why is my betta not eating?
Check the temperature first. Bettas often lose appetite in cool water. New bettas may also skip meals for a day or two while settling in.
Are female bettas less aggressive?
Generally, but they can still fight. Groups of females need a large, heavily planted tank and close watching.
Shop for this guide
- Betta fish and aquarium kit
- New Life Spectrum Betta pellets
- Fluval Bug Bites Betta Formula
- Bettas
- Heaters and thermometers
Questions? Call us at 786-642-3001 or visit the store at 8338 West State Road 84, Davie, FL (Wednesday to Sunday, 12–7 p.m.).