Bubble Magus NAC5.5 features a compact, space-saving, parabolic body cone design that enhances the efficiency of the skimming action up to 10%. Other features include an air nozzle to adjust air mixing ratio for dense foam, needle-wheel impeller, improved bubble plate, easy to remove collection cup and easy access Atman ph2000 pump. Perfect for aquariums 80 - 135 gallons. Measures 8.66 in. x 5.7 in. x 20.2 in.