Right update time. After waiting weeks for my lfs to get hold of a Potter's Angelfish for me, I took him home (was a male). He was acclimatised for 2hrs. All was well doing what you would expect. In and out of the rocks, even been cleaned by the wrasse. Saturday morning saw him in the rocks but would'nt come out all day. In the evening he them came out swam into the corner then to the surface then back into the corner followed by rapid breathing. Tested water right away stats all fine, Changed 5g to be safe but the little fella didnt make it and died within half an hour.
I will still upload pics of him!!!