Regardless of the variety, flavor, and popularity of the various manufactured foods available, there is still a need to feed your fish as much live food as possible. It not only provides a welcome change to their feeding routine but also introduces a variety of nutrients that may be lacking. 
Live food is one of the best types of food for aquarium fish.
Worms such as mealworms, bloodworms, frozen blood worms, artemia, and micro-worms are beneficial to aquarium fish.
Live fish, such as guppies and goldfish, can be offered to larger fish with carnivorous appetites.
Benefits: Rich in nutrients, high in protein, it is good for conditioning fish before breeding and live foods will not break down and decompose.
Important: You should ensure that the food you give the fish is fresh and free of decay or infection. You don’t want your fish to show signs of disease after eating something you gave them.