I registered just so I could reply to this and warn you of the aforementioned advertisement. I purchased some of their "food" on eBay from their seller name jonrocketshop. It was total garbage, and I would not recommend feeding it to any breathing animal. Many of my fish became ill from it, and I lost a few of them. I think it was rabbit food they sold as fish food. Stay away from arthur aquatics if you want to keep your fish. I don't think they know anything about koi.