My issue is Polo chases the shrimp out of the tank and to their deaths. Dante is more forgiving although I caught him harassing the apple snail when I first put it in there. That snail is now over two inches and bigger than Dante so he does not mess with it anymore. I don't know what I am going to do about that snail, it is getting too big and does not seem to stop growing. HELP! We bought two of them at the same place, same white snail and this guy is 5x the size. They are kept in different tanks though. He is easily as big as a golf ball now.