Any other ideas anyone? As i said, temps and humidity are fine and there is no sign of mites. It's possible this dent in the eye could have been there since I got him in February and I've only just notice. If this is the case, is there anything I can do to rectify it or is there damage already done?
Regarding the head rubbing, I cant hear any wheezing or popping and can see no evidence of mucus around the mouth or nose...