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					Originally Posted by  daplatapus
					 
				 
				I've always used this stuff with no problems: 
 
Only one I've ever seen at a hardware store that says aquarium safe. 
I have heard of some having it go a bit yellow but I've personally never had that happen. Get it a HomeHardware for $9 for a 3 tube contractor pack.  
			
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 Thanks! I'll check it out. Seems like an awesome deal for 3 bucks a tube! 
I've also found something at Industrial plastics that is Aquarium safe.. Let's see what that is all about!