Thanks for all of your help. 10 fish in a 75 is too many? I thought the biggest of the bunch would be the angel and hippo, and the rest would be 6 in or under, no? They are all juveniles currently, so I dont think overcrowding should come into play, should it? the biggest was the majestic at 5 inches. Anyway, I appreciate all your help. Should I treat all of them at once in QT?