I know this is an old thread, but this is GTK.
"Once cured for a full 7 days, Gorilla Glue Dries White is 100% waterproof, it can be submerged, it is non-toxic and totally inert so it will not leach anything into the water to bother your fish."
http://community.theaquaponicsource.com/forum/topics/is-gorilla-glue-food-safe
"Once cured for a full 7 days, Gorilla Glue Dries White is 100% waterproof, it can be submerged, it is non-toxic and totally inert so it will not leach anything into the water to bother your fish."
http://community.theaquaponicsource.com/forum/topics/is-gorilla-glue-food-safe
