Calling on wood workers for some assistance

[Nevin]

I think I see what you mean. The wood brace at the top of the trim should hold, but with that much pressure you might see some deflection at the bottom of the trim. And it wouldn't take much deflection to put stress on the glass.

What I was suggesting is using 2 or 3 smaller glass braces rather than 1 wide one, positioned under the wood braces so you don't lose too much access to your tank.

With the disclaimer that I have much more experience with wood than glass, I think that ought to work.

Hope this helps,
Nevin