heres a few that I have come acrosed in threads on her that sound very Tunze ,deltec, ATB ,CPR,octopus link to a review http://www.livingreefs.com/octopus-h...re-t11300.html, aqua Medic and AquaC Remora make HOB skimmers I believe there are more out there just wanted to give you a start on your resurch and i would resurch them all I personaly have a Aqua Medic T1000 multi. run great and produces alot of very dark green brown skim mate that is so smelly I can smell it upstairs by night time. I found it works best as a HOB skimmer I dose not pull as much as a in sump skimmer I do not kbow why but that is my observation.

Bill