Aqua Medic Protein Skimmer Ocean Queen 90 is an efficient and very powerful skimmer for sump use with App-control forULTRA SILENTDC Runner pump for aquariums up to 900 l water volume.Aqua Medic Protein Skimmer Ocean Queen 90+ extremely quiet and smooth operation thanks to the ULTRA SILENT pump with housing decoupling+ simple and convenient setting using App-control with smartphone or tablet+ alternative setting option using the controller supplied with the feed stop button and 0-10 V connection+ Power-saving 24 V pump+ high air entry, optimum bubble size and shape due to the new optimized Power Wheel+ innovative Foam Rails ensure precise bubble guidance in the skimmer housing+ directional foam formation by Bubble Booster in the base plate+ foam development can be controlled electronically and manually+ noise reduction due to adjustable water outlet on the bottom of the housing+ overpressure protection in the foam cup by Cup Control+ incl. effective silencer+ compact design allows