The ISTA IF-648 Hang-On Separation Breeder Box is an easy way to keep your aquarium clean and safe. This box features a durable plastic construction that is resistant to scratches and chemicals. The mesh front and wire sides help keep fish out of the box while allowing water to flow through easily. The top features a hanger that allows you to suspend the box above the water line. The bottom has two hooks that allow you to hang the box horizontally or vertically.