The Prizm is sized and priced to deliver the absolute best results for the serious hobbyist while remaining very affordable, The Prizm is without a doubt the best skimmer available today for any aquarium up to 40 gallons, The Prizm is an ideal starting point for anyone setting up a new tank or interested in maximizing the results on their existing aquarium, The Prizm can be easily upgraded to a Deluxe version with the purchase of an upgrade kit, The slim line profile (only 2, 4"" wide) allows the Prizm to be discretely hung on behind the aquarium or on the side of the sump, with it"s fully submersible motor it can even be placed inside the sump! The numerous advantages of the Prizm make this the ideal skimmer of choice for the serious hobbyist, Designed for Hang-on Tank installations -Skim-enhancing, convergent-divergent reaction chamber with ""Triple-pass"" air flow, 18-Blade ""Turbojet"" air injector - generates a constant stream of micro-bubbles in a homogenous air/water mixture -Flow regulator optimizes the skimming action for all aquarium conditions - Includes external water pump -Ideal for both new and experienced marine aquarists -User-friendly operation and set-up, SKU: RYLHC4661