Eurobracing Help Please

[Doc_Polit]

I have yet another question for you Canreefers........

My 120-gallon tank is made from 9mm glass and has no top trim, currently, so I will definitely add a eurobrace. I am also considering a center brace to make the addition of tops easier.

Must I use 9mm bracing too? I have an old 50 gallon that I can tear down but I know that 9mm can be tricky to cut. The fact that it is "old" glass makes it that much more difficult.

Would I get away with 1/4" bracing? I have plenty of clean, 1/4" glass and could easily double up the braces to, in essence, have 1/2" supports.

Your thoughts?