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That's what it looks like to me as well. But also hard to tell the shape with the one photoAppears to be ulva, but a little hard to tell. Green potato chips?
It is a macro algae. A few things eat it, tangs and urchins for example. It may die back on it’s own if you get your nitrate under control.
edit to add: I keep it in my fuge for nutrient control. Aka sea lettuce.