I have an Aqualeare Mini, 150, 200, and 300.. They are quiet and do work great for the smaller tanks but i have been having problems with the 200 and 300. There is one flaw in the design. They do not always self-prime after a power-outage and could be left running dry for hours before you could get home to fix it. Other then that 1 Mini keeps 2 of my 10 gallon tanks very clear and a 150 keeps a 20 Galllon tank clear. My 200 kept my 29 Gallon clear for about a year but is now starting to cloud up, Same thing with the 300 in my 55 gallon tank ( that is because 1 300 is no where near enough filtration for a 55, but i dont know why the 29 is getting cloudy) So yes i recomend the aqua clear brand for all smaller tanks up to 25 Gallons.