sandbed
			 
			 
			
		
		
		
		I imagine mandarin's would be out of the question then eh?  I was thinking some kind of spray bar with a smaller powerhead attached at each end might work well under the rocks as well.  Only plug in the powerheads when you're about to siphon out the tank. 
		
	
		
		
		
		
		
	
		
		
	
	
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