It sounds to me like cotton ball or cotton candy algea (don't ask me for the latin or proper name for this crap). Sort of a reddish purple and does grow sort of like cotton candy. It is a pain in the rear. The only thing I found that seemed to eat it was a sea hare and/or MEXICAN turbo snails. I added both at the same time and one or the other of them ate it all up. I have read that it is the turbo snails (and you have to make sure they are the Mexican turbos) but I am sure that the sea hare ate it as well. I know that there was a couple of threads on RC at about the same time that I was battling this and that is what made me try these methods.
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