I got my baby girls (not babies by any means they are almost 3 years old) and I was advised before I adopted them that one tends to force groom the other when she is bored as she didn't get much attention at her last home. I've been playing with them lots and letting them get comfortable with my home, but last night the one who force grooms started chasing her sister around the cage and pinned her down and wouldn't let her go. I'm curious if they're fighting or playing first of all. Second of all, if they're fighting, do they need some space or maybe some new friends to hangout with? They have lots of activities and toys so I don't think that is the issue. Any advice is wonderful. Thanks in advance :)