I've got one of the Azoo 60's running on a homebuilt cube of about 5 gallons . Got it because it was cheap and small . Had it for about 2 months now , no complaints . It's quiet , you can adjust flow , and it comes with a foam pre filter which fits over the intake tube to keep fry from getting sucked in . The only possible downside is the filter cartridge which is this tiny sponge thing . It works OK but eventually I'll figure out something better.