Monacanthus chinensis

Monacanthus chinensis, commonly known as the Fanbellied leatherjacket, is a medium-large filefish. It has a mottled pattern of cream-white and brown and a large skin flap shaped like a fan, on his belly to make it stand out from the other filefishes.

Filefishes are usually bought because they eat aiptasia. Although this is often the case, some individuals refuse to eat this. On the other hand, it's known to pick on coral polyps and their tissue and this might be an important part of their diet in nature. So these fish are always a bit of a risk with corals. They are very friendly to other fish except their own genus though.