I have a dwarf lionfish which is a lot like a fumanchu. It is the coolest fish I've had. The only issue is feeding. Lions prefer live food and mine wasn't weened off before I bought it and it won't take to frozen at all. Frozen food will litterally hit him in the face and he won't react but he hunts live fish like no ones buisness. I don't mind getting feeder fish from the LFS
but from what I've read online it's not good for them. Have had mine for 6 weeks now and it looks amazing. Its fat and the color is brilliant so I don't know how unhealthy the live food really is but it's been a challenge trying to ween him off.