Awesome tank.
What's wrong with the stocking? I've seen tilapia stocked much heavier than that and thriving. Fronts are open water schooling fish anyway, so it's not like they need the privacy. Cyphotilapia or tilapia, how different can they be?
They both come from Mozambique.Lol
I would never tell anyone this is a good idea, but if I had a breeding colony I would definitely set up a thing like this with some extra fry.
Wrong on several counts. Sounds like you're going by what you've been told by non-experts.
Yes, fronts will congregate in groups in the wild, often mostly younger fish, but they are not schooling fish, they don't swim or socially interact as schooling fish, especially not moba and other gibberosa (the southern species). Individuals like their space, especially as adults, and some especially so. Divers studying them report often seeing adult gibberosa as small groups of just a few individuals or single large males. Adults tend to live deeper than younger fish and in smaller groups.
Contrary to some of the forum posts you see, which mistakenly assume deep water means open water, they're not really open water fish. They're associated with rocky habitat, plunging rocky shoreline, boulder strewn sandy bottom, etc. A little time spent surveying taxonomic or biology sources, as opposed to some forums, and you can confirm this for yourself.
In fact, fronts very much like their privacy and they can be quite shy. Common questions and complaints from those first trying their hand at keeping them is how to get them out in the open rather than sulking and hiding. It often takes time, the right setup, a balance between too many and too few for the tank and/or the right mix of tankmates (if it's not a front-only tank) to have them be comfortable enough to see their natural relaxed behavior.
Finally, if you want to breed them (gibberosa, which includes moba), a lot of people have found their success after breaking them up into smaller groups, as in 5,6, 8, as opposed to larger groups. Not an absolute law, but this is the experience of many.