IMO, the first (and easiest) things to check are: temp not too high (78-80 is ok-lights on-), salinity around 0.025 (borrow a refractometer), and good water flow. What and how much do you feed? Lights? Nitrate, nitrite, amm., PO4,... Test test test. If any results don't seem right, borrow a different test kit to verify. If a babysitter can save a coral, it is mucho worth it too.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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