No I can not "blow" it off the rocks but I can scrape it off with my fingernail. It's been there for a few weeks and seems to be gradually spreading. It is only on the rocks, it is not on the glass, sand, or anything else.
If you can scrape it off its probably a form of red turf algae. That can go either way. It may just stay as patches here and there, or it may grow to be more of a hassle.
first time ive seen the photos on a computer (my God they are horrible) I posted them from my phone and they look great on it. I am not sure why it does that. I will try to re post the photos.
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