I am a new rat mom. I have two young female rats: Kali, a hooded top ear who's about 6-7 months old and Lilith, a hooded dumbo who's about 4 months old. I got Kali along with a litter mate who I named Harley (she was a cream hooded odd eye and my baby). A couple months later i fell in love with Lilith and brought her home. I was keeping her a in small cage temporarily while I introduced the three of them in neutral territory. Everything was going ok, but unfortunately, after about 4 days Harley became seriously ill. (I have since become aware that she probably had CURI, and Lilith likely introduced bacteria from the pet store that her immune system couldn't handle.) Since I only had one extra small cage I decided to put Lilith in the large cage with Kali and quarantine Harley. Unfortunately, despite treatment, and a brief recovery, Harley passed away about two weeks later. At that point Kali and Lilith seemed to be getting alone fine so I left them together. That was about 2 months ago. The last week or so Kali and Lilith seem to be fighting, a LOT. There cage is in my bedroom, and at night one of them seems to be sqeaking/squeeling every half hour or so. I think Lilith is the primary aggressor, as I have witnessed her chase Kali, jump unto her back and nip at between her shoulders, drawing squeaks from Kali. I've been checking them both for any injuries daily. Today I noticed there was a little bit of blood in Kali's fur near her rump and on one arm. I checked her out and couldn't find any injury (I checked Lilith as well with the same result) but clearly the blood came from somewhere. Even if they aren't significantly injuring each other, I worried one or both of them may be being stressed by the other, but I'm reluctant to separate them and have them both be alone. What should I do? Please help!