We have tried a handful of scallops thus far and have had so-so luck with them. The electric scallops don't really tend to last very long in our experience. They seem to be doing fine and then poof, they're no more. However, we kept a flame scallop for almost 2 years. He would disappear behind the rocks periodically and we assumed that he bit it, but then to our surprise he would reappear a few days later. We fed marine snow - don't know if we just got a trooper or if we were doing something magical that we didn't even realize...