I have a 55 that my female dempsey and GT were sharing I gave the GT to my nephew and bought a EBJD and put it in the tank which they chase each other pretty well but no nipping she is definatly the boss of the tank but when I shut the light off they seem to rub against each and seem very close is this normal? They r both about 2.5-3" are they too young to be a pair? And r there any dithers that would be good for them?