Not sure why yet,
But do a few big water changes and try running some carbon for a little bit even if its in the filter socks maybe a contaminate got into the tank
WC and carbon are a good start for most problems then keep diagnosing it
Fish all look ok?
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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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