Rats are rarely aggressive with each other. Right now I have two males in the same tub as a bunch of females, but one is a retired breeder that I've been waiting to die for over six months now-his manhood shriveled up long ago. I don't normally keep my breeder males together, just so I know who carries what genes.
I breed by cycling the females. They go into the breeder tub, into nursing tubs when they get big, their babies go to grow out tubs while mom gets a break, then mom goes back into the breeding tub. I've never had a problem with introductions, they just sniff each other like crazy.
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