The Red Sea Prizm Hang-on Protein Skimmer is for fish only aquariums up to 90 gallons and reef aquariums up to 45 gallonsFor hang-on use onlySkim enhancing, 2 stage, convergent-divergent reaction chamberQuiet and efficient 18 blade "TurboJet" air injector"Triple-Pass" air flow with extended contact timeIntegral water and air regulators for optimal skimmingSlim line, hang-on design, only 2.4" deep. 13.8" high, 9.75" wideUser friendly operations and set-upYou might consider also purchasing the Deluxe Upgrade (surface skimmer and carbon basket)