The fish don't really care which continent they are from. There are at least hundreds of species from South and Central America, and thousands from Africa. The key is knowing which species, what water conditions they like, and whether their aggression is matched.
For example, if that JD is with mbuna, it will ultimately be toast. If it's with Tilapia mariae (or whatever it's called now), it's probably fine. You just can't tell unless you know who the players are.
hmmmmm....3" jack with a mbuna for 2 years eh... anybody else see anything wrong with that. Let that jack reach about 7 inchs. Things will get interesting then