Sandbed Algae ID, doesn't get bubbles and doesn't fade at night.

I think you have a couple of things going on there, not just one.

If worried its dinos grab a microscope and check. You can pick one up for under 20 dollars. Worthwhile purchase.

Its hard to tell from photo despite being clear. I would say there is cyano on sand, as for rest can't make it out.
 

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