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If I was going to do this, I'd run the GFO & keep the rock in the dark.(rock cooking) Any Po4 that's leaving the rock will go into the water column for the GFO to absorb & there won't be any algae there to nab it. You won't need a CUC during this stage either.
Other than pods & such I could care less about the rock life. Most of it is pest algae & every tank I ever owned over the years, the corals end up completely covering or shade the rock surface.
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Ed
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