I still feel it is diatoms, and is just a cycle due to the large bioload and the lack of maturity of the tank, with so much dry rock, and without seeding it for the first 6 months, it is basically still dry rock, you need a small bioload, be it a few fish or a piece of raw shrimp, to seed that rock.... it isnt something that will go away in a week or two, and as long as everything is healthy, I wouldnt give it too much thought, it will sort itself out on its own. 
 
Steve 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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