GE #1 does not come in black as far as I know (only GE#2) which is why you can't find it. Home Depot in Calgary definitely sells GE#1 clear though, just bought some not too long ago. GE#2 is still safe for aquarium use once fully cured (don't believe otherwise). The only issues with GE#1 and 2 is they are not adhesives (rtv) and are made for sealing and not construction. The construction grade silicone are better for holding tanks together but the regular silicone work fine for sealing purposes. However that said I've still built tanks with GE#1 and 2 and never had an issue with either.
Last edited by sphelps; 03-11-2011 at 01:29 PM.
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