Aqua Driver has just released two new sizes in their automatic line of Skim Clean. The smallest size is 50-90 mm which means that it was designed for very small protein skimmers and might be a good fit for a nano protein skimmer. The other newly released size is the 90-200mm which allows you to purchase the Skim Clean while being able to fit a wide variety of skimmer sizes. These two new sizes are available directly from Aqua Driver. Retail pricing is unknown at the moment.