I'd go ahead and add the salt if I were you. You already have junk blowing around as it is -- why wait until it's gone, only to repeat the process when you add the salt? You might consider adding some live sand as well (after adding the salt), as this may increase the bacterial content of the sand and promote that invisible "film" of bacterial material that eventually keeps the sand at the bottom of our tanks. Not sure if this is any better than just being patient and waiting it out, but it's a thought. Personally I'd stick with the pumps at 1/2 power (maybe turn off 1 of the 3), although I'm not sure if the Darts are going to like that kind of back pressure??
Frag tank'll be sweet!
But when I turned everything on a couple of problems arose.. Maybe you all can help? The sand is a VERY fine Carribean Argonite... I made a shallow bed in the tank that stands only 3" this has the sand level about 4" under the back ports for the OM.. When I turned it all on the first problem was Sandstorm! well that locked the OMs up.. so I had to EXTRACT the Drums... the drums are now out and everything is running at 1/2 power... all throttled back... But the tank remains Milky white from the sand even a week later... still have not added salt... I took and added some fitting to further raise the ports now about 7inches above the sand.. BUT the could remains.. I guess that I could just turn it all off and let it settle 
