All Glass Aquarium AAG29051 Versa Top for 36 by 18-Inch tank. 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 Use with braced frame Contains 2 complete hinged sections Use with braced frame Contains 2 complete hinged sections