Tree frogs rarely go into deep water, so I'd just have to make sure I had a separate shallow 'pool' for them higher up where the fish couldn't get to, same thing with the geckos I think... I'll have to research that. And you could just be that nice that it evens things out to have a mean fish lol. So far Terra's been really laid back, I checked on him earlier and he was resting on Gunter's foot while she was in her little area. Maybe it's because he's young? I just found out today that he's probably only a couple months old.