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IMHO from what I have read , I would first take a powerhead in hand and hold it and gently move it over the rock in the tank, yes it will create a storm but it move it around, next, clean skimmer every hour for a few hours to help pick up the floating material, finally , add crabs and cover , lights out for 2-3 days, this will kill the algee and let the cleaning crew work awaya and make a dent in the algee. maybe another water change sat after you take the cover off.
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