Alright so I went to Home Depot and grabbed some silicone I needed to reseal my tank.. I'm still not sure if its safe to use on aquariums.. It does say its 100% silicone though.
Yup, that's the right stuff. I have straight up tubes and tubes of it on my 3D background installs and have had 0 issues. I tried GE II and it almost killed all my fish. After letting it leach for almost six months without fish it's fine now. Learn from my mistakes.