These marine PE pellets are an excellent addition to my selection of dry fish foods. As mentioned in other reviews, they are very dry, and once hydrated even slightly, they sink quickly. I like this because they soak up liquid vitamin supplements like VitaChem and Selcon very well. They also soak up medications, like Metronidazole, dissolved in water. All my fish (angels, butterflies, tangs, etc) are accustomed to eating pellets off the floor, so that's a non issue for me. The resealable pouch keeps them dry/fresh.