If you are wanting to breed to sell them, it's best to have a different tank for each species plus grow outs. Mbuna can interbreed even with species that don't look the same, so keeping a single species in a tank will guarantee no hybrids.
Mixing haps and mbuna can be difficult, most haps are carnivores and most mbuna are herbivores prone to bloat, so feeding can get tricky.
L.caeruleus is an exception to the rule, as they mostly feed on crustaceans and insects in the wild and are the most common pairing with haps. Just be sure not to get any haps large enough to eat the labs.
All fish will eat fry given a chance, so there are no guarantees. If you are planning to breed to sell, you'll want to remove the females to a holding tank (you can divide a 10 gal for 2 females at a time) and either strip them or allow them to spit on their own. The fry can remain in the holding tank until they reach 1/2 to 1 inch, then they should move to a grow out tank(s) of 40gal or larger. Whatever you do, don't use the hanging breeding nets, the females will get very stressed in them, and the adults can actually suck the fry right through the net.
Bumble Bee Cichlid
Pseudotropheus crabro - (Mbuna) Should be kept in a 6ft or longer tank as the males will reach 7" and are fast swimmers. Multiple males should be avoided as they can get very aggressive. I've had luck keeping a single specimen with other mbuna species. (As have Ferris and Kj), but have heard of keepers having their entire tanks wiped out by them.
Electric Blue Cichlid
Sciaenochromis ahli - (Hap) Again 6ft or longer, males will reach 10" or more. Will predate on juvenile and smaller adult mbuna when full size.
Electric Yellow Cichlid
Labidochromis caeruleus - Great mbuna, multiple males can be kept together with few problems. Very slow growers though, my fry took over a year to reach adult size. They can be a bit shy, so best kept in groups of 6 or more. 4ft or larger.
Blue Peacock Cichlid
Aulonocara stuartgranti - (Peacocks) Technically they are haps, but all of the
Aulonocara are collectively known as peacocks. Pretty peaceful, shouldn't be kept with aggressive species.
L.caeruleus are one of the few mbuna that can be kept with them. 4ft or larger.
Marbled Peacock
Aulonocara sp. - Same as above. Note that this is a man made hybrid.
Mbuna would be your best choice for easy and prolific breeders. There are several hundred species so I would recommed seeing which ones you can get, posting them here, and we can help put a good group together. Also knowing what size tank you're getting will help. When looking at tanks, focus on length and width rather than height, as mbuna tend to stay in the lower parts of the tank.
Any other questions, feel free to ask. -Dawn