The Red Sea Prizm Hang-on Protein Skimmer is for fish only aquariums up to 40 gallons, soft coral reef aquariums up to 25 gallons, hard coral reef aquariums up to 18 gallons

Skim enhancing, 2 stage, convergent-divergent reaction chamber

Quiet and efficient 18 blade "TurboJet" air injector

"Triple-Pass" air flow with extended contact time

Integral water and air regulators for optimal skimming

Slim line, hang-on design, only 2.4" deep. 13.8" high, 9.75" wide

User friendly operations and set-up

You might consider also purchasing the Deluxe Upgrade (surface skimmer and carbon basket)