Need ID! Longest Algae Ever?

[BloopFish]

I've never seen an algae this long. I'd say the longest strand is nearly a foot. Doesn't appear to be hair algae, more like a weird brownish clearish macroalgae of some sort? It's attached to the clamshell. Trochus and astrea snails simply eat whats growing on top of it.

 

[Malifry97]

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