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The one-tank-one-betta rule

Male bettas fight. A single male belongs on his own. Females can be kept together in a sorority only if you introduce them properly and have space for them to claim territory. If in doubt, keep one per tank.

Minimum tank size

A betta needs at least 20 litres of water. Smaller containers trap ammonia and make temperature swings dangerous. Bigger is easier, not harder.

Filtered and heated water

Bettas are tropical fish. Keep the water between 24 and 27 degrees Celsius with a small heater, and run a gentle filter with a slow flow. Driftwood or floating plants give them calm corners and resting spots near the surface.

Feeding

Feed a high-quality betta pellet daily, and skip one day a week. Treats like brine shrimp or bloodworms are for a couple of times a week, not every meal. Overfeeding is the most common cause of dirty water and bloating.

Daily and weekly care

Check your betta every day for appetite, colour, and clamping fins. Do a small water change weekly. The details live in the water parameters and health guides on this site.

New-fish checklist

Quarantine new fish for two weeks.
Acclimate to temperature over 15 minutes.
Drip-acclimate to the tank water before releasing them.

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