Rimless Ultra Clear Tanks by Ultum Nature Systems These rimless aquariums are carefully crafted using 91% clarity Diamant glass, a highly transparent extra clear glass with very little residual green color. The low iron content in the glass provides uninterrupted crystal-clear visibility. The 45° mitered edges are bonded together using high-performance German silicone specifically designed for aquarium construction. Each Ultra Clear Tank comes with a black leveling mat. Why UNS Rimless tanks? 45° Mitered Edges 91% Clarity with Diamant Glass High-Quality German Silicon Free Black Leveling Mat. Model Size Glass Thickness (mm) Volume (Gal) 16 T 6.3 x 6.3 x 9.45H in 5 1.6 16 x 16 x 24H cm 20 T 7.88 x 7.88 x 11.81H in 5 3.2 20 x 20 x 30H cm 25 T 9.85 x 9.85 x 14.17H in 5 5.5 25 x 25 x 36H cm 30T 11.81 x 11.81 x 17.72H in 5 10 30 x 30 x 45H cm 3 T 12.21 x 7.49 x 9.45H in 5 3.4 31 x 19 x 24H cm 5 T 14.17 x 8.67 x 11.02H in 5 5.4 36 x 22 x 28H cm 45 T 17.72 x 11.02 x 14.17H in 6 11.3 45 x 28 x 36H cm 60 T 23.62 x 14.17 x 17.72H in 6 24.3 60 x 36 x 45H cm