ok i have a few fish in my 135(redfin sharks,dats,snooks,giraffe cats,irwini cats,yellowfin barbs,sexfasiatus,leperinus)i think its my tap water but my snook have ick.temp80-84 ph 7.2 nitrite 0 nitrate 0 phos. .50. salt, dont know the s.g. level. no gravel,have 20 gal sump with carbon bags in a 200 micron bag. what the f'in deal?? are the snook stressed from all the commotion in the tank or what?? what do you guys think???oh last water change was 11/26 30-40%