3 days ago my Tig swam into the back corner of the tank and has been "glass swimming" pointed towards the surface since. He does not look distressed, no pinkness, good color, no rapid breathing or any other signs of distress. He is eating like an animal as well, no loss of appetite. He just hovers there, treading water. I checked everything and even dropped in 2 huge airstones too make sure there was enough disolved 02 in the tank. Temp=80.5, PH=7.2, Ammonia=0, Nitrite=0, Nitrate= less than 5ppm, KH=3, TDS=160, so as near as I can see, there is no damn reason for him doing this??? Any ideas???

