Eheim Surface Skim 350Eheim Surface Skim 350 Ready to use immediately. In almost any aquarium a film of including microorganisms, dust, oils and food fats forms over time the mould film. Also great for skimming off duck weed from the surface of the aquarium! With the EHEIM skim350 surface skimmer, you can efficiently eliminate this mould film and have a glass clear water surface and high oxygenation. The EHEIM skim350, although designed for constant use is also suitable