Well, there is a way thats fairly cheap. I went out and bought some sewing board. You know the kind old ladies make designs on. I found one that had a very fine mesh and decided that would work. I then went to Home Depot and purchased some OSC which is basically vynil weather striping for glass doors. I cost about 50 cents for the mesh knit board thingy and 77 cents for the weather stripping (8foot length). I also bought aquarium silicone at Home Depot for 2.97 which was 3.00 cheaper than the LFS. I measured and cut the knit board and had to sew two pieces of it together with fishing line. I then cut the weather stripping to size to fit from the bottom to the top of a 20 gal tank and used silicone to seal it in place and poof a very nice better than you can buy at the LFS divider custom made to size and style. total cost for 4 tanks = $6.51 versus 11.99 each at the LFS and mine looks and works better.