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What do you have for filtration? If you have any type of mechanical filtration start cleaning it every 3 days. Run with the lights off for a week if you don't have a bunch of corals. One reason you have no detectable Nitrates and Phosphates is because the Algae is feed of of it. What do you have in your refugium besides mangrove. I would ad cheeto and run the light 24/7. Blow off your rocks and suck out what you can when doing water changes. Good luck!
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240G reef, 24G nano reef
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