Awesome frog man!!! It is a little to early to tell just go with your gut instinct on what he or she is and btw your set up is wicked cool he must LOVE ITcongraton the new pixie and for your question holding 3 pixies together honestly i know and have seen people do it on here and on you-tube i would do a little more research on the matter before you put any more in the tank well have a good one