I just bought (yesterday) a couple 4-eyed butterfly fish for my 120 tank. I also have a heniochus butterfly that is a couple weeks old. The fish are very helathy and active. The heniochus eats everything I put in. The 4-eyed haven't taken to the food I have yet though. They pick at the rock all teh time. I tried flake, frozen brine, emerald entree, and cyclopees. So far they haven't been interested. Is there something else that butterlfy fish prefer to eat.... Thanks