If you feel your fish aren't getting enough food it might be a good idea to feed them more times a day. I feed my fish three times a day, morning, afternoon, and after dinner. That way I can feed them a large variety of food in small amounts and they really seem to like eating throughout the day. Plus that way even if they still act hungry I know they are all getting enough to eat. If anyone walks near one of my tanks the fish all come up to you acting like their starving and they haven't eaten in weeks, lol. I think in the wild fish graze all day so it makes sense to me to feed em more than once a day.