Like others have said, research into the subject will mostly recommend GE1 because supposedly it doesn't have mold inhibitors. GE does have a disclaimer on the package to not use their product for aquarium use, not so much because it is toxic but rather because their law team recommended this IMO. They make gazillions of dollars selling these silicone products for home improvement purposes, they don't want to be liable for amateurs/hacks, in a tiny market, suing them for doing things incorrectly and damaging their homes/properties.
That said, I've used GE1 to resealed my 180 in 2013 and have been growing out a bunch of CA, and haven't had any issues. Everybody is growing and seems to be doing just fine. I would like to make clear that I only used GE1 to resealed and not rebuild the tank.
That said, I've used GE1 to resealed my 180 in 2013 and have been growing out a bunch of CA, and haven't had any issues. Everybody is growing and seems to be doing just fine. I would like to make clear that I only used GE1 to resealed and not rebuild the tank.