Reptology Turtle Topper – above Tank Basking Platform That Safely Mounts to Standard Size Tanks Including 10G, 20L, 20H, 29G, up to 55 Gallons and 13” Wide – Black Color (REP600). The Turtle Topper is designed for standard sized tanks up to 55 gallons and 13” wide including 10g, 20L, 20H, 29g, 55g, and more.