Betta Fish

A heated, filtered tank of at least 5 gallons is the real minimum for a betta — not the bowls or unheated cups they are often sold in. Water temperature should stay between 78 and 80 degrees F, which requires a small aquarium heater in almost every home. Bettas have long, delicate fins, so filtration should produce gentle flow (a sponge filter or a baffled outflow works well) rather than a strong current that exhausts them. Always use a tight-fitting lid, since bettas are surprisingly capable jumpers. Choose live or silk plants over stiff plastic ones, which can tear their fins.

Bettas are carnivores and do best on a high-quality betta-specific pellet as their staple diet. Rotate in freeze-dried or frozen bloodworms, brine shrimp, and daphnia for variety and enrichment. Feed only what your betta can finish in about two minutes, once or twice a day — overfeeding is one of the most common mistakes and leads to bloating and constipation. Skipping food one day a week gives their digestive system a break and is a normal part of a healthy feeding routine.

Bettas are solitary and often aggressive toward their own kind — hence the name fighting fish — so they should not be housed with other bettas except in carefully managed sororities of five or more females with plenty of visual barriers. Brief exposure to a mirror occasionally lets a betta flare and display, which is a natural and healthy behavior in small doses, though extended exposure causes unnecessary stress and should be avoided. A floating leaf hammock near the surface gives them a natural resting spot, since they periodically rise to breathe air through their labyrinth organ. Many bettas learn to recognize their keeper and will swim to the front of the tank at feeding time.

Fin rot (a bacterial or fungal infection usually triggered by poor water quality) and ich (visible as small white spots) are the two most common betta health problems, and both are far easier to prevent than treat. Swim bladder issues, often from overfeeding or bloating, cause a betta to struggle swimming upright or float sideways. Dropsy, a swollen, pinecone-like appearance, signals serious internal illness and needs prompt attention. A heater is not optional — cold water suppresses a betta's immune system and is a major contributor to illness. Weekly water changes of 25 to 30 percent, always with a dechlorinator, are the single best preventive measure.