OK so I have 4 rats(2.2) in a 18gal Sterilite Bin. So I hear them all night throwing each other around, and I thought maybe it was the males fighting, but it seems like the two males are fighting the one female and for no particular reason. The one male has crusted red blood around his nostrils. I don't see anything else other than that on them. Idk what the deal is. Should I take one male out? If there's anything I left out let me know. Any help in appreciated