When you check your paramiters please post the results. Letting us know placement, flow, and lighting would also help. Could be the lighting. Are you running halides and if so did you acclimate the coral to the light. You could be 'frying' it if placed directly under a halide. If its a newly imported coral make sure you place it low and in indirect light and gradually move it to brighter light over time.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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