Some people make things more complicated than they need to be. Just purchase some high quality fish feed and feed your fish. They will inhale it. I have used Purina Aquamax MVP with great results. I am purchasing feed from Endurance (the old Optimal) and am having great results with their new formulations. I am using the Endurance Bass 22 mm hand throw pellets. Similar to the old Optimal Hand Throw. My larger fish love it.