Thank you Fluffagrams, dreamtree, cypher and Lizzy
He still seems annoyed by the whole thing. I probably did a very stupid thing though which hasn't helped. I decided to rearrange his cage so that his "living quarters" were closer to Pasha. I was at my wits end with him a couple of days ago because all he wanted to do was run around on the floor, not play in his boring cage or boring ranch. I thought maybe a change would be good but it hasn't helped. I'm annoyed at myself for changing things as I should have left things alone a bit longer before doing anything drastic! He barely seems to sleep during the day either. He was always around a lot during the day but he seems to be living on a human timetable!