Its called coraline algea grows with when calcium, alk and the paramaters are in check, it takes a while to grow and get re-etablished if you moved or changed tanks
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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