to add to the list of opinions here:
Vinegar dosing along with feeding your fish once every two-three days, scrubbing it with a tooth brush, then siphoning out.
With rocks they you can take out, you can scrub them with a tooth brush and then pour a diluted solution of hydrogen peroxide over the HA (there is a large thread on Reef central about that), just keep up on the gap/carbon changes.
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