The IceCap Bio-Sphere Media Tower is a simple structure that allows the stacking of five Bio-Sphere Balls on each of its nine support rods to provide a more visually pleasing way of containing up to 45 total bio-sphere biological media. The stacking of the media will increase filtration efficiency when compared to placing the media in a detritus-collecting mesh bag in the sump. Bio-Sphere media are sold separately and designed to work with IceCap, Maxspect, and Mantis Nano-Tech Bio-Sphere media, all sold separately. Specifications of the IceCap Bio Sphere Media Tower Approx. dimensions: 11 x 11 x 11cm (L x W x H) Holds Up To: 45 Bio-Spheres (1kg capacity) SOLD SEPARATELY Colour: Black Base with Clear Acrylic Rods