Yup, as stated above, once or twice a day. If leftovers fall to the bottom, then they have been overfed. As Zagz pointed out, they will beg for food, but don't fall into the temptation. Our Africans will swim to the top and beg for food and act hungry all day long. It's hard to resist those cute little eyes, but they sure appreciate it since they don't have high nitrates.