Man, this skimmer has taken a beating for years.. IMO, if you understand the limitations of the unit , and don't expect the same results that a high end remora or a some downdraft would give you ,then it is a fine choice.(10-15 Gallon Tanks.) I have used them on my NANO'S before, with the said mentioned mods and has worked fine for me. I replace the cartridge with a Poly-Filter, run a bag of carbon in the back ,( large filter box a +) and a gang valve to bleed off excess air for the airstone. The noise is from the impeller not being seated correctly... Make certain that the plastic piece that holds the airline inside is seated nice 'n' tight, then twist the motor a bit at a time ( slowly) until you find the sweet spot... Peace