I was more concerned about the sliders with the corys. The fronts should be able to handle it. But all of them reach about 14", obviously some slight variation with the different strains. Your "7 striped" front is most likely a regular C. frontosa as those are the only Cyphotilapia species with seven stripes. All C. gibberosa have six. Here is a good visual to help with the ID'ing of fronts:
http://www.cichlid-forum.com/articles/frontosa_variant_map.php
http://www.cichlid-forum.com/articles/frontosa_variant_map.php