flatworm exit would work well in that tank cause your able to get in there and suck them all out you could try a head shield nutibranch but they don't usually do well in small 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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