If it's reappearing that quick, I'm guessing its cyanobacteria. Excess nutrients (nitrates and phosphates) and excess lighting will just fuel it. Don't stir it or try to bury it - just siphon it out with some of the sand. It'll come back, but stirring it up just makes things worse. Work on the list that melosu58 linked to and you'll probably get over it.
Just another comment about the tank picture - you can take that air intake tube off your powerhead. All it's doing is creating a bunch of microbubbles in your tank which aren't really helping with aeration. In SW
, most of the aeration occurs at the surface of the tank, and in a skimmer. That's why its important to have good surface "ripple."
Watch your ammonia and nitrite and don't add anything live until both those go back to zero. You might see a little mini cycle after adding the rock.
PS... Also looks like you're going to want some additional flow in there. Is it just that single powerhead right now, pointing up? You'll probably want a couple additional powerheads on each end, in the back corners, pointing diagonal across the tank making kind of an "x". The additional flow should help from getting dead spots in your tank where cyano
likes to set up camp.