is this hair algae or some type of moss???

[Magnum Man27 141]

I have hair algae in another tank, and it gets “stringy” this came in on the American frogbit, and is not stringing out, stays curled up, wooly looking… thoughts as to what is actually is???

 

[Tomsfish6 50]

I always found this link helpful when trying to ID and treat algae.

Algae in the Planted Aquarium-- Guitarfish