Xtreme Nano is a small 0.5mm sinking pellet food made with natural ingredients with Krill being the first main ingredient. It is great for tetras, rasboras, livebearers, corydoras and more. In fact, most small community fish go nuts for this food. A little bit goes a long way as the protein level is 50%. If you breed fish, raise fry or have a community tank with nano fish, you'll want to try out Xtreme Nano.