Betta Fish Care Guide: Tank Size, Diet, and Tank Mates

Betta fish (Betta splendens) are one of the most popular aquarium fish thanks to their flowing fins and vivid colors, but their reputation as a “low-maintenance bowl fish” is a myth worth correcting.

Tank Size

Bettas need at least 5 gallons of filtered, heated water. Contrary to pet-store folklore, they do not thrive in small unfiltered bowls. A properly cycled tank from our aquarium collection gives them stable water quality.

Water Temperature and Quality

As tropical fish, bettas need water between 76-80°F. A reliable aquarium heater is essential, especially in cooler climates. Keep ammonia and nitrite at zero — see Understanding Aquarium Water Parameters for testing guidance.

Diet

Bettas are carnivorous and do best on a high-protein betta-specific pellet, supplemented occasionally with frozen or live foods like bloodworms and brine shrimp. Avoid overfeeding — a few pellets once or twice daily is plenty.

Tank Mates

Male bettas are territorial toward other bettas and long-finned fish that resemble them. Peaceful options include corydoras catfish, small rasboras, and snails. Avoid fin-nippers like tiger barbs. Browse our full betta fish selection to see color and tail-type variations, including our Glo Betta Green.

Common Health Issues

Fin rot and ich are the most common betta ailments, usually triggered by poor water quality or temperature swings. Our guide to treating ich covers early symptoms and treatment.

Final Thoughts

Give a betta warm, filtered, spacious water and a protein-rich diet, and they’ll reward you with years of vibrant personality. For species background, see the Wikipedia entry on Betta splendens.