I have one on my 29G. I bought it slightly used. It works pretty well once it's broken in. You will experience microbubbles for a bit but after a week or so, it's gone. It's a bit loud though. I did the silencer mode w/ a prescription pill bottle and it quiets down extremely while keeping the airline fully open for best skimmate. Just google the silencer mode. You'll find it. For reef tanks, take the bio bale out (2R doesn't come w/ it) and leave it empty. You can use the empty compartment as sort of a sump to run gfo, carbon, etc. Just make sure you don't block the overflow.