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Old 09/10/2021, 03:26 PM   #2
Snarky Shark
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Join Date: Jun 2017
Posts: 45
I’ve treated small areas directly with 3% hydrogen peroxide. Do it in advance of water change it will kill off algae so it should not come back. Do a little each week with water changes and you should start to see a difference. I wouldn’t recommend using if you have sps in the tank.

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