UNS Shallow Rimless AquariumsDescription Ultra Clear Shallow 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. Rather than following