Oh--use some selcon in your food also-- + I think they make a frozen food specifically for butterfly fish (I could be wrong here)--but in the wild, they eat lots of little clams, mussels, stuff like that, + anything they can stick their long nose into a rock and find. Like I said though, they're not used to picking it out of the water. (I read a TON about this when I got my 2nd one)