I usually feed mine twice a day - when their tank light is first turned on, and about half an hour before I turn it off in the evening. Everyone is different in the way they feed their fish, how often, and the amount - the reason? Because every fish is different. You can't directly apply someone elses method to your own tank, but you can use an idea. At the end of the day it is really down to what works for you and your fish.
Some people do two medium sized feeds, others one good feed, and others three small feeds - three small feeds is probably best, as it would be more like what they would get in their natural habitat - small, frequent feeds. But there would also be times when they cant find food in the wild - and by skipping feeds now and then you can sort of replicate this. One good feed does not mean a big feed - it just means providing them with what they need, or, rather, what they want, before their next feed in 24hrs time. But the choice is up to you.
Thom.