I had the same problem.  for me it turned out to be the tak board thats under the carpet, however if your on hardwood, then i dunno.  you could try stryofoam under the stand, but your best bet would be to ask Mike or one of the other guys @ hidden reef.  Or maybe someone with more expierence on here can shed some light on your situation. 
 
nice tank btw 
		
	
		
		
		
		
		
	
		
		
	
	
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