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Yea that's Ricoridea floridia. I don't think blocking it from light will be as effective as pointing a powerhead directly at it. Or you can use your fingernail to peel it off the rock, trying to get as much as you can. It could leave a little bit there to regrow but you could do the same thing to get little new ones off.
Just curious, How many watts of pc do you have over your tank?
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