Ok, I siliconed the first piece of glass, the bottom glass, to the tank. I also felt I needed to add some silicone to the inside of the black rim to avoid possible leaks. I know these are made to prevent leaks, but I have seen enough of the rims fall off old vivariums to take the extra precuation.
I used black silicone to attach the glass to the black rim of the tank.
I used clear silicone and a spatula pictured above to reinforce the silicone seal on the inside of the black rim to avoid leaks. I know, Im paranoid,
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A closer look.