What is the lighting? When I used MH bulbs something similar once happened to me. It turned out I had a bad ballast that some how was causing the corals below the bulb that it is powering to RTN (maybe excessive UV due to uneven power, I dont know).
Also keep in mind stressed corals under high flow can rtn pretty rapidly because a small tissue recession can get bigger as the flow peals off more skin. What are your watere parameters.
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