DescriptionThis Fish Tank Filter Ball is a simple and practical fish tank filter tool, which is very suitable for fish tank or aquarium use, and very suitable for the water quality purification in the fish tank. Therefore, an gift choice for your friends who want to farm some pet fishes.Features-Color:Random Color-Material:Quartz-Size:3.00X3.00X1.50cm/1.18X1.18X0.59in - The structure is simple and easy to use, which can meet different sizes of fish tanks.-Large water storage space is convenient for effective cultivation of beneficial bacteria.-This product is of safe material and durable, you can use this product with confidence.-It can help form a good ecological cycle and are very safe and practical. Trickling filter is a sewage treatment system that provides a large surface area for the growth of beneficial bacteria colonies.-Although this Aquarium Filter Ball is simple in design, it is very practical when used.