16 to 20 mm glass price

[sphelps]

15mm is all you need, just brace your plywood sections properly and it'll be more than strong enough. Even a standard 230 gallon is 72x30" and only uses 12mm, however they do bulge a little so 15mm is likely perfect. I wouldn't use 19mm unless you're really going light on bracing.

You'll have to call around and see what they charge over there, glass prices vary depending on location.