The top of my overflow is flush with the rim (top) of my glass. (see photo) The only way to install my euro bracing is on the top of the glass. I have looked at many tanks, especially one tank from "Tidal Gardens" that has there euro bracing 1" thick at least, on top of the tank instead of on the inside!!! And other tanks with the bracing on the inside. The inside measurement's of my tank is 23"H x 23"W x 59"L. All 1/2" glass. The overflow is 20" which leaves me only 1 1/2" on each side, and the two long braces would not fit either. I guess I'm forced to install the euro on the top. Maybe someone from the #reef squad could give some good advice!! THANKS David