A couple weeks ago, I adopted four male rats from their old owner who couldn't keep them anymore. Their cage is small for four of them, but there's not much I can do until I get a job. They cuddle each other lots, but at night as they get more active they start fighting a bit and it's mostly just playfighting as far as I can tell (I have two girls in a separate cage that have little arguments, but they've never gotten bad so I'm inexperienced with fighting..) For the first week my boys didn't fight at all, and then I deep cleaned their cage really thoroughly because their past owners clearly didn't know how clean to keep a cage etc, and wiped down their tails that were shades darker than they were supposed to be. Then they started fighting, and it seemed to be getting worse as two of them, Cupid and Iris, had scabs. I don't know how to tell if they're fixed or not, I just know that I'm their third owner.