What you are experiencing here is a Diatom algae bloom. This is common and all new tanks go through this stage. Keep good flow, good cleanup crew and lots of patience..it may also help to syphon it out if possible, but dont syphon too close to the sand..
Its nothing to worry about..
Recomendations for a cleanup crew - simply a mixture of 10 red and blue hemits and mixtureof 10 snails. What you need to do is start out with a baselink for the crew, add a few more at a time if its needed. Its quite common for people to hammer in loads of hermits and snails because you see all this brown algae everywhere...however, once the bloom has gone, the actual food supply for the large ammount of inverts is not enough and they start to die as they will starve..i certainly would not recomend going by a certain ammount per gallon or buying one of these pre-made up pachages from Liveaquaria.com as they are way way too big for the tanks they recomend and enevitably, some will die..them packages should be banned !!!
Niko
