HKM-871699 Activated Carbon Cube for Fish Tank Water Purification Filter - Honeycomb Shape, Multiple Sizes AvailableIntroducing the HKM 871699 Activated Carbon Cube, designed specifically for effective water purification in your fish tank. Crafted from high quality carbon, this precision filtration solution ensures that your aquatic environment remains clean and healthy for your fish. The activated carbon features a unique honeycomb shape, maximizing the surface area for superior filtration. Available in multiple sizes, you can choose the right fit for your