I've had that kind of algae before. I never found anything that ate it, although maybe a rabbitfish might?
With this one I let it grow because it wouldn't really spread. If it got too big I pulled it off the rock (came off all at once). I don't think it ever came back after I pruned it.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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