Killifish Care Guide: Colorful, Short-Lived Jewels of the Aquarium

Killifish are prized by dedicated hobbyists for their extraordinary color range, though they remain less well known than mainstream community fish.

Natural History

Many killifish species evolved in temporary pools that dry up seasonally, producing drought-resistant eggs that can survive dormant in dried mud until the rains return the following year. This unusual life cycle is part of what makes them fascinating to keep and breed.

Tank Setup

Most killifish are small and do well in modest tanks of 10-20 gallons, ideally with dense plant cover and subdued lighting that mimics their shaded natural habitat.

Water Quality

Many killifish prefer soft, slightly acidic water, though requirements vary significantly by species, so research your specific type before purchase.

Diet

Killifish are primarily carnivorous, doing best on live or frozen foods like brine shrimp and daphnia, supplemented with quality flake or pellet food.

Compatibility

Many killifish are peaceful and can join a quiet community tank, though some species are more aggressive, so check individual temperament before mixing.

Browse our killifish selection, including the Aphysosemion bivittatum Killifish (Pair).