Kumar, I used to feed my breeding fish my own made beef heart. Now I have gone away from it because there are so many other options. My concerning about the beef heart is two fold. It is not a natural food for discus. They are not piranha fish and unless they are attacking a poor cow somewhere in the Amazon River they are not eating beef. The second concern that I had was fat/gristle. A fish could not digest beef fat/gristle that might find its way into the beef heart blend. Lab technicians have developed nutrient filled fish food that include more vitamins, minerals, and even color enhancers than any beef heart blend will