Eheim presents a skimmer for marine water aquariums of up to 300 litres that is adjustable, with needle wheel impeller technology, an independent air intake and much more. The Eheim skim marine 300 has a skimmer with outstanding technology and user friendliness, according to the company. The skimmer is powered by a highly efficient needle wheel pump (impeller) and has an adjustable air intake which sucks in air independently and determines the skim rate. It is easy to attach the skimmer to the aquarium glass using the magnetic holder or it can be installed in a sump if preferred, according to Eheim. www.eheim.com