Is this cyano?

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Ya looks like the start, just siphon it out and play with your flow a little, looks like you may have some detritus settling there
 
Check your parameters. You have excess nitrates and/or phosphates. Get those in check.
 
I did, it went away for a day, came back. Woohoo, Cyano, just what everyone loves!

Nitrates are 0
Phosphates are .1-.2 area.

Maybe a dead spot then... Increase flow in this area if you're able to...

Or maybe just siphon them by gravel vaccum and let's see what happen...
 
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