those things will eat anything. I came home one day and i had those 3 long black with a white stripe school fish (don't know the name), but one was gone, the other was dead at the bottom and the last was still alive but in my groupers mouth, which he ended up dieing from the wounds. The funny thing is that my group was only a baby and was a lot smaller than these fish. It was crazy, i didn't know what to think