fast setting something
			 
			 
			
		
		
		
		A bit ago I posted a question about a safe sealant that works underwater and will fill a gap of about 3/16th inch.  As I expected it likely doesn't exist.  The next best thing is something that cures quite quickly, 3-4 hours ...and then is fish safe.  Does anyone know of something like that? 
 
I have several sealants that are safe after 24 hours but I am not sure how long a person can leave their tank without the pumps running. 
 
Any suggestions? 
		
	
		
		
		
		
			
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