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I've recently, after years, just had some crop up in my tank as well. I believe it is because I no longer have a tang in the tank. I think it is Scinaia complanata, a red macro algae from the Atlantic.
I'm sure they would Cmor. lol
Bearfan, I should also mention that this stuff has taken to growing on my hydor pumps. It seems to really like high water flow. Just a heads up.