I don't see anything I could spot that would indicate the smaller Lab. Car's are hybrids, but just by some off chance if they were, you'll probably see some signs of that when they get near adulthood or a bit bigger. From all I could see though, everything looks normal to me. I'm really not an "expert" on that aspect though, just using what I've learned so far.
I've ended up with a few hybrids from stores by accident in the past, when I went to trade them out for newer stock, I brought the ones I wanted to vacate for more room only to find they weren't a true species. The guy took the time to show me what to look for.
What I learned was something like this. I had a Blue Barred Zebra really big and dominant. He didn't have a female around and basically kept trying to spawn with the female Peacocks I had so he was the first to go. When I brought him over to swap out, the guy was showing me how his face/head was different then a blue bar zebra, but the body had traces of yet another species in him. Little minor aspects like that, where a shape or fin size goes outside of the typical look of a species are signs of hybirdization, that I have not been able to really see in fish when young, but as they aged and got older, become more apparent.
I will say this from seeing how these things were spotted, it takes a trained eye, and I am still training mine just in case. I keep my species, best I can with 1 male to every 3-4 females, though sometimes I have no choice but to run with just a pair. I try to avoid keeping solo's of a species if at all possible so this will avoid the temptation of say a lone male to look for females of another species. It helps to deter hybrids by having males and females of the same species, but it's not 100% fool proof it can't occur. Odds are it probably won't happen, but you can help yourself by not keeping too many single fish species in your tank.
From what I saw, looks good, though you listed a Jack Dempsey in with those Africans? I might suggest you re-home that one. JD's are known to be highly aggressive to the point they could potentially take over a tank that size. I'd do it just as a precaution. Just curious off hand, are you keeping that tank in true Malawi conditions in terms of water chemistry?
Forgot to mention!
And a sidenote. I just separated the 4 brooding fems, and they are all "spin spawning"!??!?!!