I had the same problem before. As teemee said, you need to throw your cheato away, or save the very best part of it to grow it again. I was religiously doing 20% of water change everyday, for the whole week, and scrubing with a toothbrush on the rocks before changing the water to get rid of hair algae. After that my tank has no hair algae coming back until now. I have changed my water every 2 weeks since then.
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