Is this purple hair algae?

rachelrose48

I have been treating my tank without any fish in it for about a week with prazI pro. Since not having fish, my tank has broke out in a bunch of green algae. I realized soon after that I was leaving lights on for too long. So now I'm keeping lights off. However, now there is what I think it purple hair algae. All ammonia nitrite and nitrate levels are at 0. Am I doing something wrong? Is it dangerous to fish? Sorry idk why the pictures are sideways. But the purple hair algae is only on sand.
 

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