I have the Oceanic Skimmer on my 14g Biocube and I am enjoying it. Dawgdude is right about it being a little difficult to get adjusted right. It took me a good week to get it set right, but after I did it is pulling alot of skimmate for its size. Oceanic says that for best quality you need to replace the airstone once a month, but depending on your bioload it could be more or less. I found mine for under $30 and have to say it was well worth the investment on my small tank.