Oh ok... no wonder it didn't mention it in the books I have..did not know that. can I get one that will be ok with this one in the same tank? I have read they will sting and eat others..although they had bubble tips in the same tank with these..quite a few actually. maybe 4 or 5 of each kind.. I have 3 tanks so I can move him to another tank if it is not good to have them together. let me know..thanks!