Hi all, after 3 month of running well reef tank one the new animone died and crash all my tank I really lost my fishs and money  only two fishs survived foxface and blue and yellow damsil. And all coral they are fine. My question is how many water change I need before add new fishs? I think the acid was realy bad thing from animone it was hide between rocks and I don't think it was sick or not doing well cuz before 3 or 2 days it was in good condition. I did 10% water change with changing all media in the sumb and today also I well do one more. My tank is 200 gallon and my sump is 50 gallon with skimmer. Any suggestions? Thanx in advance