I have a 75gal oceanic aquarium. The measurement for both the "24 in" glass pieces are really 23 1/2 inches. I want to order a replacement canopy but I'm not sure if it will fit my tank. When I look online I can't find the real dementioins of other canopies. Its kind of frustrating. Can anyone help... I thought I herd all-glass is a sub division of oceanic or maybe the other way around not sure. But I need help! My tank is standard 48in x 18in!! Thanks for any help anyone may offer!