Who is to blame! I am racking my brain here on what went wrong. Aquarium: 50 G with live rock and a couple of corals. Zero ammonia, nitrite and nitrate and has been since the start (after cycling that is). It is not filtered and not skimmed but the water is always clean and I do 5% water change weekly. The tank has been running since Januray. All fish added are quarnatined for 1 month in a 10 G tank. I had a green chromis and a bicolor angel. The green chromis has been there for almost three months. The bicolor has been in the 50 G tank for three weeks and 4 weeks before that in the quarantine tank. Yesterday I saw a few white spots on the bicolor (that was not a good morning). I took both fish out, gave them a fresh water bath for 3 minutes and then put them back in the quarantine with a couple of gobys that i had there and added a dose of copper sulphate. This morning I found the bicolor dead with no white spots on his body, but the other three are fine. Where the hell did the white spots come from and why did he die?. I recently (couple of weeks) got a batch of saltwater from an LFS and later I found out that he had an outbreak of white spot. Could he have recyled his saltwater and sold it as a freshly premixed? Have you known an LFS to do that? or Am I trying to blame someone other than my self!