I picked up panels of 1/2" non-temp glass that was used in a standard 8' long 240g tank. I had the bottom panel that is also 1/2", cut in the middle so I can achieve a 96" x 48" x 24" (480g) size tank. After doing research on the safety facor chart I was between the 3.8 and 4.0 range with bracing via different sites.
A friend has me concerned that the glass is too thin and needs to be 3/4".
Thoughts on continuing with the 1/2" build?
The bottom is going to be either PVC or plywood.
I think your friend is mistaken. 1/2" is the proper thickness of unhardened glass for a 24" tall tank, assuming adequate bracing. 3/4" is appropriate for a 30" tall tank.