Honestly they don't need to eat 2 or 3x a day. Once a day is fine. Some people actually get snails like ramshorns or common pond snails and keep them in their own little tank so they can breed. They breed like crazy when there is an abundance of food available. Then as the snails get larger they add them into the tank with the loaches. I've kept various loaches for over 30 years and I've used this method when my loaches have literally eaten the population of snails in their tank.