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To be clear, my question was whether or not to bring FC back up to 30 (must algae shock lvl) or let come down to reg shock level. I will OCLT Thurs night.

About 5 days ago I noticed a few baseball sized spots of yellowish stuff on the hill of my pool and a line of it on the crest of the hill. I assume this was mustard algae. At one point last week I had let my FC down to 2 which is below min. I brushed it up and got FC to 13-15 to host a party...