I'd check for montipora eating nudibranchs. They sometimes hide when the lights are on so check after the lights have been off for a while. They are tiny, less then a 1/4 inch. Use the gel glue.
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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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