Happy to see another african cichlid keeper on these forums. I'm honestly surprised we don't have more people on here with larger africans like fronts and stuff.
Your frontosa may one day grow to eat most of those fish but they do grow VERY slowly, ontop of that their growth is extremely variable. I've found of my 6 fronts that all started the same size only one is growing at a reasonable rate and he's twice the size of the next fish and 4 times the size of the smallest. I hope you keep us posted on your tanks developement.