Yeah, I agree that was pretty rude!!
Looks like you've got some nice coralline on your rocks, but the sandbed is definitely Cyano
comes from too many nutrients in your water. Cut back on the amount of your feedings, and possibly take a couple hours off of your light cycle. On your water changes, siphon out the Cyano
, it should come right off like a blanket. You may see it for a little while, just be vigilant, and keep sucking it out.
If you limit what's going into the system, it will dissipate.
Best of luck, Sanchek
PS. Don't just blow it around, it will land somewhere else and spread.