ah crap - That looks like cyano or red hair algae... I'm not sure which... What I had started off as a small chunk on a rock, noticed it had a lot of air bubbles on it, figured out it was cyano.
It might not be spreading now, but it could soon - you're great at water changes, so maybe slowing down the feeding? When did you start to see it spread, did you add anything else in the tank around when that happened?
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