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Mike if you were breaking it down I would keep the rock and get rid of the sand. Keep the rock in trash cans with heater and powerheads and it will be alright.
Herb run a high dose of carbon 24/7 once they start RTN there is little hope if you need a hand I can come up there and help you out. Like they say two heads are bettor then one, and when the tank gets stable I have plenty of corals for you.