28G JBJ Nano Cube Replacement Filter Basket & Sliding Door. Also for the JBJ 30 and 45 Rimless. Replacement JBJ 28 Gallon Nano Cube Replacement Filter Basket & Sliding Door. NOTE: As you see in the picture, these Filter Baskets are somewhat dirty. We've recovered these Baskets from broken tanks. They originally contained carbon, which caused the staining. They're new, but they're not pretty.At last, a media basket for the 28G Nano Cube. Detachable door allows the media basket to be maintained but still forces water through the media when in operation. Basket is 9.125" tall by 4" wide and 2" deep.