Known as microgeophagus ramirezi this fish is one of the smallest of the cichlid species growing to 3in.
This fish is sometimes added mistakenly to a tropical community aquarium because of it's size. This is not a good choice because it will harass bottom feeders such as Peppered corydoras. This is best kept with small south american cichlids. Possibly a kribensis?
Feed it live foods and cichlid foods. Rams might also take flake food.