I had a remora for about a year. I didn't like it. Sure, might have had something to do with my set up, but I just didn't have much luck with it. Personally, I like the reef octopus line of skimmers. They have excellent HOB models and their stuff is top notch, yet competitively priced. I currently have an in sump model. When I first made the change to a system with a sump, I was convinced that it was superior to HOB. 3 years later, I can honestly say it's not. A good HOB is skimmer is just as effective, and I would even say to a point better because the intake charge of water is directly pulled from the tank itself.