important tip on GE Silicon 1 by jcgd
(While GE1 works just fine and is safe, I would personally not use it for an adhesive for assembling aquariums.
Any other use, go for it, but be clear that is is a SEALANT and not an adhesive.
For building aquariums I recommend an adhesive type silicone such as Momentive RVT-108. If you want black try RVT-103.)