Here's our heavy duty, commercial meat grinder grinding up some of the cooked turkey hearts. It's important to use a meat grinder and not a blender when processing the ingredients. You don't want the food to get mushy or slurry. Blenders tend to liquefy the food. So, use a meat grinder when making your own discus fish food. The fish food will then have a nicer, pasty texture. If you need to make a lot of fish food, it's a worthwhile investment to purchase a more expensive, heavy duty meat grinder.