they are getting aggresive and dominant. i would say move them into something bigger than a 55 if youre planning on keeping them together (but find out if they're males or not, because they WILL kill eachother if they are) or just separate them. i don't keep any of mine together, not even the male and female . i still have the runt and his (ii think) colors are incredbile. when he get's a little bigger he'll make me some good $$$$. MALE:
MALE:
FEMALE: