I'm finally be able to hand feed My Koi Fishes. Well not all of them. I trained them to eat in my hand. At first they were just biting my hand but later ate with it. I have about 8 Koi fishes. 3 of the still don't eat in my hand especially the biggest one and the 2 small ones. But the 5 who are 4 inches are eating in my hand but they eat a few seconds and runaway. A Pet store owner told me to never let go of my hand with the food. It took at least an hour to put my hand in the water but after almost 2 weeks they now eat in my hand. The store owner told me that they can smell food in the water, and if you deep your hand in the water they will be eventually force to eat in your hand. I'm so happy. 
