75 gallon tanks brace

Question
My 75 Gallon tanks middle top brace is broken how/where do i get the materials to replace it, if i cannot replace it how long will it take for it to buckle

Answer
If it is a glass brace you can take it to a glass shop and they can silicone a new one in... or you can find two stiffer pieces of plastic and drill holes in both pieces and the old brace and sort of tie them together with wire.... keep me posted please... dave