Mikky, once a day is enough for all but the smallest fry. The advice on the tin is also correct, only feed what will be eaten in a couple of minutes. I give mine 3 or 4 minutes to eat it all but do not feed enough for any to fall to the bottom unless you have some catfish on the bottom that need feeding. If you do, you can estimate what part of the total needs to go to the bottom for them to get enough to eat. If you are using a food that sinks easily, take your pinch of food and put a bit of it in every 30 seconds or so and let the fish keep up with you. As soon as they don't eat everything you put in with that bit of a pinch, it's time to stop and remember how much you fed for next time.