I have had a single marble angelfish for 4 years now. I have Never had the tank crash, isease outbreak anything atall infact i still have 5 original Cardinal tetras from the first year. My angel has spent the last day or so floating lifelessly round the tank almost as if it cant be bothered to swim. It hides in rocks and under the bogwood breathing slowly and takes a long time to come out to eat when he used to be first in line. i have just placed food in the tank and he is now just staring up at the side of the tank ignoring the food. Anyone got any ideas whats going on the only recent change is that i bought bloodworm from a diferent LFS meaning it was a different brand to what was normaly fed. Could this be just old age?