Good to know... Back when I got the lid for my daughter's Fluval Flex 32.5 you guys couldn't make it a single piece...Some updates to the info here with changes that have been made over the last year. We now use 3/8" polycarbonate, which is thicker than what Top Lids uses (I believe they use 8mm or something slightly thinner than 3/8") and most likely Clearview uses 3/8" as well. We also build lids up to 38" wide in a single piece (yes some that size and under are offered as a two piece, but that is due to customer preference).