A brief run down of the situation. 125 gallon DT with 60 gallon sump. All params in check and haven't moved in weeks. About 2 months ago a Sunset Montipora was wiped out over night by RTN. A week after that an Acro colony that was in my aquarium for nearly 3 years was wiped out over night as well. Since this all started I have done water changes, media changes, etc etc etc. All to no avail. I have lost 7 colonies in all. I have fragged that many more into multiple small pieces. This morning a Green Slimer that is/was 18 inches tall was dead from the bottom to about 8 inches high. I fragged it and spread it around the tank. I haven't the slightest idea what is happening to my tank. Nothing has changed. No additions to the tank in months. Every single SPS coral in my tank has been affected with the exception of the Milleporas. To say it is frustrating is an understatement. This could drive me out of the hobby. Very disappointing. Any advice out there???