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I know this post is super old but I have the same problem in my tank. Did you beat it?I have this persistent and apparently very hard to kill algae. Several minutes of 3% hydrogen peroxide knocks it back significantly but it eventually comes back. And I can't realistically treat 75 lbs of live rock, loaded with coral with peroxide. Has anyone dealt with this nightmare? I'm about to tear down the tank, frag everything and start over with fresh rock but if there's an alternative option, I'd like to try that first. I added 3 emerald crabs into my 75g tank today in hopes of them helping.
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