The other yellow fellow looks to me to have a lot of labidochromis in him...but not a pure strain lab. caereulus (presuming you mean the yellow fish in the third pic, second post with pics). He doesn't look like an elongatus (pseudotropheus genus) in my opinion.
The best set up for him with other africans would be a tank in excess of three feet, and lots of other africans for company. A tank with just him, the kenyi and zebra would be very unpredictable - because there would be too few fish to prevent the weakest fish (probably the yellow fellow you are most attached to) would be picked on so much...resulting in very likely a dead yellow fish unfortunately.
My advice would be to try and accomodate a 55 Gallon tank, stocked up with your Africans, and keep the cons as a pair in the 29G. If this isn't possible, keep the cons in the 29, and your fave yellow guy in his current tank (what size is that tank?). Return the other fish (zeb & auratus).
I agree it is more a matter of a few months than any period of years before the auratus matures into a problem fish.
I think the fish in bossmans avatar is a neolamprologus sexfasciatus...but I could be wrong (I am counting six stripes - if it is five striped its a tetracephalus I think)
A breeding pair of convicts won't be safe for any other tankmates in a 29G.
No need to apologise for posting in this forum ! Its exactly right for your mix in any event. Keep your threads and posts coming and I'll shove anything specific in where you will get the most answers - members on AC are incredibly helpful especially here in the cichlid forum and all we demand is a) pics of your fish & tanks (yours look great btw

) and b) you keep on posting and helping us out in our threads as well
edit : I looked at the yellow fish again...I take it back on the labidochromis...I think it is in fact mostly male kenyi based on 'lips' and eyes...I am a stoopid head
