It's a wirey algae. I honestly don't remember the name of it. It is a pain to get rid of, but doesn't tend to be too much of a nuisance. Most people have luck getting rid of it with rabbitfish.
Mine got to be a bit much so I got a Mexican turbo after doing some research - some people don't like em because they are big and plow around but he has not topped anything over and mows the grass nicely
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