glass is just as expensive (if not more) once you get into drilling and shaping... unless you happen to have the necessary tools lying around... or are doing lots of tanks and just have to have them.
then there's the edges. you can smooth them yourself but it's not fun unless you're real patient, wear safety gear and don't mind glass splinters. it's still better than risking slicing yourself with wet hands... let alone what contamination that could cause.
there are other companies that sell polycarbonate sheets. maybe less expensive than lexan. lexan does have desirable properties too. heat resistant, high light transfer rate and doesn't block uv too much, strong and semi-pliable makes for basically shatter-proof, more scratch resistant than acrylic and some forms have an extra coating that almost rivals the scratch resistance of glass. all around it's not a bad option.
then there's the edges. you can smooth them yourself but it's not fun unless you're real patient, wear safety gear and don't mind glass splinters. it's still better than risking slicing yourself with wet hands... let alone what contamination that could cause.
there are other companies that sell polycarbonate sheets. maybe less expensive than lexan. lexan does have desirable properties too. heat resistant, high light transfer rate and doesn't block uv too much, strong and semi-pliable makes for basically shatter-proof, more scratch resistant than acrylic and some forms have an extra coating that almost rivals the scratch resistance of glass. all around it's not a bad option.