u/camera-boar88

I have two rats now. I've had a full grown rat (Temple since mid October. I just bought a younger rat today (Minerva). Temple looks likes she trying to hurt her. Sometimes it looks like playing but then Minerva is being pinned down by temple and she squealing. Sometimes it seems like temples biting. I don't know what's going on. I got Minerva cause I heard rats need social groups. Finally got her a little sister and it seems like she hates her. Is this normal?