 The butterfly splitfin has a reputation of being a fin nipper, but being a large and robust fish, it will certainly bully small and delicate species like guppies or small tetras.When housed with less tender species that require similar conditions, it is a great fish for any tank type; even the hardier species of "Apistogramma" and similar dwarf cichlids make good companions, with water parameters compromising between the splitfins' and the cichlids' requirements at a point similar to most tap water."A.