This morning I checked mag,calcium,phosphate,alk,salinity,ammonia, nitrate,nitrite, and ph everything was great could use a little calcium that was a bit low at a 300ppm and I keep it at a 450. my water is really good. His eyes are not sunk in and now his body at the tip of tail is turning white and his top fin is going away. Ron I just want to take a moment to thank you for time and help with this issue. I have cried most of the day cause I don't know what to do this has been my most serious issue and you seem to be the only helpful one today. just your concern has helped ME more than you will know my fish are like my kids