Yes, they are made by Marineland and are the same as the Penguin filters except for the bio-wheel. I have a Regent Aqua-Tech 5-15 which is like the Penguin Mini. Yours is like the Penguin 330. As I mentioned, never change the white cartridges as they are meant to house the nitrifying bacteria. When you change the blue cartridges only do one at a time and wait a month in between. By the way, you can save a lot of money by rinsing the blue cartridges in a bucket of aquarium water. Did you, by any chance, purchase an aquarium starter kit from Walmart? That's the only place I've ever seen Regent filters. You can't find out too much about them on the web but if you do a Google or Yahoo! search you'll find some articles about them. The filters themselves are pretty good at mechanical filtration. I've been running mine for 4-5 months and I still get excellent flow through the original cartridge. I did cut out the carbon though.