I just fought a battle with this stuff, not quite as bad but a few of my rocks did look like that also. I bought some turbo snails about 2 weeks ago. Now I don't know for sure if it was them that ate it all or because its winter now and I have been back to my normal weekly water changes and better tank maintenance schedule but it is basically gone. The sails were on it so I think they did help.
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Jennifer
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