I had an old Seaclone that was just laying around, so I put it on my 55 g reef tank, which already had an Aqua-C Remora (around $150-160 if you can find a deal on-line). The Remora continued to pull out gunk, while the Seaclone did hardly anything. If a Seaclone is the only skimmer on the tank, it will work, but rest assured it is leaving a lot of stuff in the water!! Save your money for something that works. (CPR Bak-Pak, Aqua-C Remora)