Welcome to AA.
A 60g long will be a good size for African Cichlids. Be careful of the mix. Some of them are a lot more aggressive than others. And If no one has mentioned it, Cichlid males like to have a harem. You need to have 3-4 females for every male. If you don't, you will have to the death battles. And Cichlids have some nasty teeth.
Don't get me wrong, I love mine. They are beautiful and a kick to watch. But with Cichlids, you never know violent they may be. Each one has a very distinct personality. they may get along great as Juvenal's, but when they reach adolescents they may start to kill each other