That makes him a boy! He'll be a very pretty fishy one day. He eats meat, but it's unsafe to feed fish that you didn't raise yourself because of disease. The other two can get really sick if they get much meat, but they will happily gobble it up anyway! Also, fat from warm blooded animals is another thing to avoid.
The Venustus is a a "hap", who mostly hunt for small cichlids in the wild. The other two are "mbuna", who pick algae off of rocks and on a lucky day, maybe a few invertebrates. That's why they'll take meat, but they aren't built to digest more than a small amount at a given time.