Oh Man, sorry to hear this. One of the few tanks that we have yet to see. What a shame. I to have used this silicone, but have left things for weeks before i used it, with no issues. As for your sand, wash the crap out it and you should be fine. Good luck, and hope things pull through. 
		
	
		
		
		
		
			
				__________________ 
				210g Display
			 
		
		
		
		
	
		
		
	
	
	 |