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ID assist - small brown things growing on tank wall and rocks

Vicarious Cynic

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So - long story short - I neglected my tank for a year - now trying to clean it up. I've gotten the hair algae under control, and treated for Cyanobacteria. I have these things that grow mostly on the glass. They are about 1/2 centimeter long. They are paper thin flat bodied, and have a little red spike at one end, the end opposite the spike flutters in the water. They propagate very quickly - as in I scraped them off last night and they were back today (I'd estimate 200 over the front of my tank. I've tried to put a photo in.

Any ideas on what they are and what to do?



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