Hi i've got 4 angelfish and 3 of them are healthy and have nice untwisted fins. One of them has his fins clamped down and his dorsal fin is also twisted slightly. There are no problems with my water quality what so ever so i'm kinda lost on what could be the problem. 2 days ago he seemed to have slight cloudy patches on his tail and a little white patch on his dorsal fin which weren't there before so i gave him 2 salt baths throughout the day and they have now disapeared. Any helpful info on how i can correct this problem would be great!