I need to reseal my 130-gallon glass aquarium and it would be much much easier to do this if I was able to climb inside. I know that once it is filled it will hold a lot more weight than me, but I would worry about creating pressure points and cracking the bottom glass. I am not small. Looks like it's 5/8" thick. I don't know whether it is tempered or not. What do you guys think?