I just got a ValentinI Puffer! I'm very excited about the little guy, as I've wanted one for quite a long time. I've always heard to not feed saltwater fish freshwater fish - don't feed freshwater feeders to saltwater predators, due to some sort of fat imbalance or something like that. Does that apply to feeding freshwater inverts to saltwater fish? Could I feed this guy ghost shrimp and pond snails on occasion for live foods? Or should I steer away from feeding anything from freshwater? He'll be getting frozen shrimp, clams, live hermit crabs, etc., but I think being able to feed something as easy and cheap as ghost shrimp and pond snails would be pretty great.