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			 Steve, I ran about 2" of sand and my NO3 was undetectable also. I added more sand to bring it up to about 3.5", and I don't see any benefit. Jamie just removed his DSB about 2 months ago, and I'm waiting to hear back from him regarding his thoughts so far. 
		
	
		
		
		
		
			My sand is about 4+ years and I'm starting to get some ugly algae problems on the sandbed, so I'm also following that thread closely!! 
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		Brad  | 
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