CPR Aquatics has recently started shipping their newest protein skimmer, the AeroForce Protein Skimmer. It is a hang-on-back (HOB) protein skimmer that utilizes a Hydor Ario pump. Notice on the right hand side of the skimmer that there are no microbubbles (at least in the video). This is a great thing of course since you don’t want microbubbles ruining the look of your aquarium.
The retail on these is about $200 and they have a tank rating up to 75 gallons, depending on the bio-load of course.