What is this on my sand?

tubz

Reefing newb
My algae on my rocks finally is almost all gone and now my sand is ugly.
 

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How long has this tank been set up? It almost looks like cyano, but a little too early in its development for the bubbles. If it's a new-ish tank it's probably just your next step in your algal succession. Do you have any nassarius snails or anything to help turn your sand?
 
Lastly, are there bubbles in the algae, or have you tested for phosphates? Based on color alone, I would lean on cyano, but there would have to be bubbles. Is this a FOWLR tank? If so, obviously a lights out for two or three days could go a long way.
 
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