I have a 55 g tank, four damsels, a percula clown and a yellow tang.
Temp: 76F.
pH: 7.0
Total alkalinity / buffering cap: 200
Nitrate: 20
Nitrite: 0
"Goldie" (as my 2 year old calls it) started to develop a faint orangish haze along the top of the back, in front of tail fin, and now is evident...