well if it's been drying chances are it's killed everything on there.
Next would be to put into a tub with a heater and powerhead and let the stuff rot off and decompose. (takes months)
Or theres the acid method, but I'm not familar with that.
I use peroxide to kill most algaes and put the rock back into the tank. Algae turns white and dies off.
yes returns nutrients to the tank, but that's what the skimmers for.
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