I've kept it around 2' directly underneath my MH so it has recieved a lot of light in the past. However if you had it in a dimmer area for a while and then moved it back to a high light area that could do it. For now I'l put it in a dimmer area regardless. Too high of temperature will also do it. Did you tank over heat at all lately? Solid organic carbon dosing often does this to LPS and softies too. I had to quit my little experiment after a few of my coral started bleaching.
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