hi everyone - I did look through previous posts but really don't want to lose my catfish (who does?) it's 18mnths and is normally a barrel of laffs but 2 days ago he decided to leave the tranquility of his corner and flitted about quite uncharacteristically, bumping other fish and nipping in & out of the foliage. Yesterday spent a lot of time putting his head out of water for 1 second ish at a time now he is just lying at an angle almost upside down , appears to be gasping and doing a gentle body wriggle whilst doing so. The tank is a 180l juwel with a 2 month old charcoal replace filter with all the usual - 2 airstones etc.. I've done a 2-% water change and tested for ammonia and nitrItes - ammonia was high b4 water change as were nitirites , but are low now - any help would be gratefully received guys, thanks