The Optifish Screwcumber is a superbly practical aquarium vegetable holder and weight feeder. It offers a different approach to weighing down vegetables in your aquarium. This product is popular with aquarists worldwide because it works and outlasts suckers and clips. It is a genuine alternative to lead, which can bruise vegetables, resulting in early degradation. The Screwcumber can easily be found in the gravel and used again and again. It provides a lead-free and simpler solution to weighing down a variety of vegetables for tropical fish that eat them. Simply thread your desired veggie onto the unit.