Bulkreefsupply.com has several products available to help you make screen tops for your particular tank size. We carry clear netting in both 1/4" and 1/2" screens, spline and spline roller and framing as well as pre-packaged kits to make your DIY (do-it-yourself) screen top a cinch. Screen tops are great because they keep your fish in the tank while still letting the appropriate amount of light and air circulation into the tank.