The ONLY product from about 10 different brands that cleaned my 75 gallon reef of red goo. I haven't lost any fish or snails or crabs or sea cucumbers or coral. Lost 2 mint shrimp. All bad algae (including small patches of green hair) disappeared within a few days. Coraline is not affected. Let it sit for 4 days before a 20% water change just to get it working. I had to hold the skimmer down for about a week before it stabilized. The water is crystal clear again. Planning to try this on my 120 gallons next time.
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