sera glas-clear 

Even with good aquarium maintenance it is not always possible to avoid slight algae growth on the aquarium glass, for example, with bright green spot algae. Algae-eating fish or snails generally leave unsightly remainders. So what can you do make glass sparkle? sera has introduced the sera glas-clear algae magnet, which solves the algae problem quickly and thoroughly. Made to work on both sides of the glass, the inner cleaning part is a brush made from high-quality, durable plastic, and the outer part is soft felt. This ensures the glass panes will have no scratches even after years of use. The two parts are connected by a lightweight cord that enables you to pull the cleaning brush out of the aquarium, without getting your hands wet, if should it drop into the tank.