What is this pink stuff growing in my fish tank?

There is some slimy pink skin in my fish tank, and there there is something growing under it, whenever I poke the side of the fish tank it sucks in sort of like a hermit crab. The pink stuff is growing on a live rock.

Can you post a picture? Sounds like some kind of algae, but that description is vague. Could be an egg sack of some kind, but its hard to guess with that information.

P!nk - Glitter In The Air (GRAMMYs on CBS)

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