Hey guys, its been a while since i've been on maast. However i'm running into a problem i noticed a week ago. First of all i'm not a big fan of water changes. I think its been about about 10 months since i've done a 20% water change. I have about 30-40 fish in my 650g and notice some of my tangs, foxface, and angels were shedding. Fins were damaged and now some parts are scared on their bodies. I thought they would be fighting or rubbing their bodies against the rocks. However, there was no sign of ick and the fish were not rubbing against the rocks. They swim fine around the tank and all eat well. Untill yesterday i noticed that my powder brown stopped eating and my koran angel was shedding close to the face. This has never happened before untill i added one box of the diamond carbon too the tank to clarify the water approx. 1 1/2 ago. Is this a sign of Lateral lime disease, PH problem or something like that? I've done a 25% water change today, took out the carbon, and will see how well they eat tonight. Water peram is fine btw.