Up Aqua's Low Iron Rimless L-series Nano Tanks are a package deal with 4 aquariums in varying sizes. Each glass aquarium is meticulously assembled with straight and true beveled cut glass and a fine application of high strength silicone, making the Up Aqua L-series nano aquarium not only watertight and rigid, but also aesthetically pleasing to the eyes. Low Iron glass gives high clarity for your viewing pleasure.