Hey b.tavis!
Territory issues are probably going to be a constant sort of issue with most cichlids....and P. Kennyi (I assume this is what you mean) are probably one of the more aggressive mbuna so you are probably only going to frustrate yourself if your goal is to have an entirely peaceful tank in this case.
In general, there are at least two ways that are commonly suggested regarding keeping cichlids on their best 'behavior'...at least as far as I have observed (and I am sure there are more....but these two are the most common IMHO and IME).
1.) You can do your very best to ensure that the tank has absolutely no areas for the cichlids to create a territory within since this is one of the reasons for all of the aggression (defending that territory)....which I have tried and have to admit this is sort of tricky because in the absence of anything else, a heater and/or the underside of an HOB filter can suddenly become like the world's best real-estate to cichlids -- come to think of it, I actually tried this with a few Kennyi in the tank; but they were not the most aggressive fish at the time so I can't recall who was the most dominant.
2.) You can do the extreme opposite and try to create as many nooks, crannies, caves, etc.... for your fish to establish themselves within since this would not only help provide a somewhat less dominant cichlid a place to run to when being chased by a 'bully', and/or help reduce the instances of the cichlids swimming past each other. Additionally, as you are making all of those potential territories in your tank, you would be best served by trying to reduce as many 'sight lines' across the tank as possible; meaning, you want to block and/or reduce the ability of the cichlids to see all the way across the tank since this would somewhat reduce the size of a territory in that one cichlid cannot see another and feel as though he/she needs to go after them (out of sight, out of mind).
Like I mentioned, there may be other theories out there as well, but some additionally 'tips' and/or tactics would be to change the decor or aqua-scaping (if any) in the tank around from time to time since this would help 'bust up' any strongly held territories - hence, throwing the hierarchy in disarray to some degree (this is also a good tactic to use when/if you ever want to add more cichlids of the same or different (but compatible) species. One of the best tricks I learned when first starting out in the 'cichlid world', and still use to this day, is to add dither and/or target fish in the form of some hardy, fast swimming, usually schooling/shoaling community fish in a relatively high quantity since they are more apt to remain in the open water (especially when bottom dwelling cichlids are present - which is the case more often than not...including Kennyi), drawing the attention of the most dominant cichlids (who chase them, but because they are fast, hopefully cannot catch them) as well as helping the less dominant cichlids feel more safe as they also venture out into the open water. Some good examples of dither/target fish that I have seen being used, and have used myself, are Tiger Barbs, Giant Danios, some species of Rainbows, Mollies/Platties, Silver dollars (if the tank is large enough to hold five or more over the long-term duration), and a few other fish with similar attributes (for example, I am currently using Arulius and Odessa Barbs as dithers in my cichlid tank)
While I am sure I am forgetting a bunch of good info, ideas, or tips, (these are the only ones I can think of at this very second....probably due to an increasingly harsh case of 'old-timers' disease), I also wanted to point out the fact that you should be leery about keeping your adult Kennyi with a bunch of fry since they will almost certainly become a snack for anyone who has a large enough mouth to swallow them --- even the mom would do so eventually. If this is your only option though, I have had some success in keeping at least a slightly larger amount of fry (versus losing them to adult fish) by using a larger grained substrate such as the pebble-like versions, along with adding a densely packed area of fake plants since both of these provide some shelter for the aspiring adults....again, out of sight, out of mind...however, the best bet would be to keep them in a different tank (grow-out tank perhaps....if you want to call it that) because I have witnessed a fry or two getting gobbled up when they came out of hiding to chase down some food I had just provided. All of that is, of course, under the assumption that your fry are still that small....which, if they are, you can probably feel more comfortable about the fry and adults mingling together once they reach about an inch and a half or so. I guess it would also be good to keep in mind that while Kennyi are relatively small fish as compared to some other mbuna, they can and will start breeding long before reaching that size - hence, being leery about the fry is only compounded later on since, as the adults grow, their mouths also grow (obviously....I don't mean to insult your intelligence)
HTH,
TG
