thing to remember is that tempered glass will only bow about 1/2 it's thickness before it shatters, while plate glass will bow approximately it's entire thickness.
Also i'd highly recommend buying low iron glass, I have 5/8 reguler plate on my tank and there is noticeble distortion looking thru the glass at the fish, always wished i'd have forked oput the bit extra.
Also i'd highly recommend buying low iron glass, I have 5/8 reguler plate on my tank and there is noticeble distortion looking thru the glass at the fish, always wished i'd have forked oput the bit extra.