The Bubble-Magus NAC3.5 Cone skimmer is practical and highly efficient. This skimmer offers innovative features at an affordable price: which makes it a great value. NAC3.5 Features cone skimmer body to allow smooth transition of skimmate to the collection cup needle wheel pump with venturi intake that produces just the right amount and size of air bubbles bubble plate to reduce the turbulence in the reaction chamber collection cup drain to reduce maintenance frequency compact footprint that allows easy installation NAC3.5 Specifications Tank Capability: 25G-80G Pump: ph1100 Air intake: 300L/H Pump power: 8W, 110V 60Hz Max Chamber Diameter: 4" Dimensions: 4.7"L x 7.08"W x 17.3"H Water Level: 8"-10"