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					Originally Posted by  jagermaier
					 
				 
				As both Brad and Unclesalty mentioned, GE SCS1200 is a safe and very good choice. I've had many tanks built using this silicone and even recently used it on a bulkhead in my sump with only 24 hour cure time with no issues to any fish or coral including sps. I would recommend using it as long as you can find it. 
			
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 I just bought mine yesterday for $6.79 a tube and it comes in black also #1203. It is a silicone "construction adhesive" not a "sealant" like most. By far the best product out there and I would bet all tank builders use it.