In a lot of ways, they are pretty easy. They keep to themselves and just kind of wait for food. I give mine Hikari brand Massivoure sinking pellets. He loves them. Krill, silversides, shrimp pieces, live anything (although, mine loves the sinking pellets so much, he doesnt even go after the live rosies anymore). I have been putting live feeders once a week for everyone and he doesnt go for the rosies anymore, but live ghost shrimp he still likes. Um, even earthworms. He blends in with some of the live rock in the tank. I will say that whatever he can fit in his mouth, he can eat and might want to so i wouldnt have him with like a small clown or damsel or anything. Also, they might do this weird skin thing where they turn all white and they "shed", but they should stop that after a while. Mine did it for like 3 days after i got him. As long as no one bugs him, he shouldnt bug anyone. Since he does blend in with the live rock, you should be careful when putting your hand in there since he can sting you by accident and such. I think thats about it, he is pretty basic. They are very awesome fish though.