Angels, Tangs, Butterflies, Mollies and many other freshwater and marine fish are natural "pickers". They graze 90% of their day picking at the surfaces of wood, corals and rock. It is important that they are offered plenty of seaweed and algae throughout the day. This will strengthen their immune system, reduce aggression and improve their overall health. Traditional and Untraditional seaweed feeding tools have used suction cups, clips and rubber bands that held seaweed with one point of contact and if not secured properly, had the chance of detaching wasting the food and polluting your aquarium. T Just open, insert any size seaweed and snap close. The magnet-mount allows for easy insertion and control, keeping your hands dry and food secured!