American Flagfish

The American flagfish is a killifish of the pupfish family (Cyprinodontidae) that lives in the planted swamps and lakes of Florida. The rows of red spots running along the males' olive-green body and the dark spot in the middle of the body resemble the stripes and the star field of the US flag. In the hobby it is best known for eating hair algae and other fine algae. During breeding the male guards the eggs on the bottom or among plants and aerates them by creating a water current with his fins; this kind of care is rare among killifish.

• At least 60 liters for one male and two females.
• Dense plants, good lighting and algae-covered surfaces to graze.
• 20–24°C is ideal; it adapts well to unheated room temperature.
• A tight lid; 25% water change weekly.

Omnivorous and needs plant matter. Spirulina flakes and tablets, blanched spinach and the algae in the aquarium are the basis of its diet; it should be supplemented with frozen daphnia and brine shrimp. It may also nibble soft-leaved plants.

Males are territorial; especially in the breeding season they are rough with their own species and similar fish, and they may harass the fins of slow, long-finned fish. It is more compatible with sturdy, fast tankmates.

Good companions: medium-sized, fast and sturdy fish: zebra danios, rosy barbs, platies, corydoras.

Avoid: slow, long-finned fish (bettas, long-finned guppies), very small and timid species.