Every kind of fishfood is the best kind of fishfood! VARIETY is key. Flake, pellets, freeze dried, frozen, fresh (such as table shrimp or veggies), there all good. Just make sure you feed food items that are keeping with the fishes nutritional needs (eg., a betta would get tropical flakes and pellets, most freeze dried and frozen foods, as well as fresh foods like shrimp - try to exclude most veggie matter when feeding bettas as hey are insectivores, while a common pleco would get mostly algae, algae discs, and vegitable matter - becuase common plecos are for the most part herbivores), and include VARIETY in the diet, and your fish will enjoy there diet WAY better than eating any one single food item every day, no matter how good that single food item may be.