Aquarium Co-op's Nano Sponge Filter comes with an Easy Flow Kit to make your filtration system a breeze. This sponge/foam filter is suitable for all water types and requires no modifications. Its size makes it perfect for small aquariums. This filter is a great addition for any fish enthusiast. The brand, Aquarium Co-op, is known for their high-quality products and this filter is no exception. The Easy Flow Kit makes for a more efficient filter, ensuring your fish have the perfect environment to thrive in. Keep your aquarium clean and your fish healthy.