I had a similar problem. All parameters seemed OK but I was using a float style salintiy test. When I measured with a refractometer I found that I was up around 1028-1029. Once I brought it down everthing came back and the corals overgrew the algae tips.
Joe
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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