Is it that red in real life? It looks like some kind of algae. If it was my tank, I'd leave it for a while and see how it acts before trying to get rid of it.
red turf algea (google image search to confirm)
Same treatment as most other algae. I've read posts of it spreading and taking over a tank. My experience differs. I have some in my 65 that looks nice on the rock its on, and has never branched from it.
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