Our glass tops are perfect for reducing evaporation and keeping fish from jumping out of your aquarium * Each Versa-Top features a clear vinyl back strip that can be easily cut to custom fit your accessories * Special store use Versa-Tops feature heavy 3/16 glass with notched Corners for air lines and larger glass sections that allow easier * Our glass tops are perfect for reducing evaporation and keeping fish from jumping out of your aquarium. * Each Versa-Top features a clear vinyl back strip that can be easily cut to custom fit your accessories.