Neetroplus nematopus

Neetroplus nematopus is the sole member of its genus and is found in the rocky littoral zones of Lakes Nicaragua and Managua, as well as associated rivers. Despite reaching only 12 cm, it is legendarily aggressive and territorial — capable of driving off and harassing much larger cichlids when defending a territory or brood. It is a fascinating biotope species for aquarists who appreciate behaviour over size, and is excellent in single-species or carefully managed large mixed setups.