I noticed a problem with my one angel this morning... She's on her side at the top of the tank.. She was not like this yesterday... I have done some research and it might be swim bladder... I do feed dry flakes and small sinking pellets once every day, in the morning. One web site mentioned that this could cause a bloat problem for her.. I also have (2) redlines, (3) yoo-yoo loaches, (3) clown loaches, (2) gold fish, and (2) algae eaters. Everyone is pretty good sized, with the angel about full size.. I've had her for a couple of years now.. I did notice something at the base of her fin... Please see the pictures.. Not sure what it is.. I haven't had any problems with her before.... I hate seeing her this way... I did a test of the tank water: PH = 6, hi PH = < 7.4, Ammonia = .25, Nitrites = 0, Nitrates = 40-80.. I am doing a water change now.. Tank temp is 80 deg. No other fish are exhibiting any problems... Any ideas? Lori