Seems to be a lot of JNS sk2s up for sale lately and almost no info on them unless you read or understand Chinese or Japanese which ever it is. These skimmers are of modest size and are of dimensions of many other skimmers and run similar pump ratings but rated for up to 300 gallons. Anything in English raves about these things but they're being sold for other skimmers. How can a skimmer of equal proportions and water/air flow be rated for such a large tank and no one seems to say over they are rated like they do other skimmers? It's just accepted. Why sell such a great skimmer that is small, 9x9x22 and works on a tank as large as 300 gallons? Seems like the dream skimmer.