I made this divider for my fish tank so the fry could have more room than a small breeder. I used plexiglass, scored it with a utility knife, and snapped it with my weight and a pair of pliers. Unfortunately, there were some small holes so I cut a thin strip of fabric and stuffed it along the messed up edge, and it worked great! I soaked the fabric in hot water/chlor-out to make sure it was safe and wouldn't bleed into the water.