Superfish Algae Cleaning Sponge Keep your aquarium glass clear with the Superfish Algae Cleaning Sponge, a simple and effective way to remove everyday algae and limescale build-up. Its very soft nano-structured surface helps lift dirt and deposits from aquarium glass without the need for harsh cleaning chemicals. Ideal for regular maintenance, it makes it easy to deal with light algae before it becomes more difficult to remove. Why we like it Removes algae and limescale from aquarium glass Soft nano-structured cleaning surface Ideal for quick, regular aquarium maintenance Helps keep planted aquariums looking clean and clear Simple, inexpensive addition to your aquarium cleaning kit For best results, clean the glass little and often rather than allowing stubborn algae deposits to build up. Tip: Take care around the substrate line. Gravel or sand trapped between the sponge and glass can potentially scratch the aquarium.