The things around their mouths. That is a good ID marker, but I could not count them in the pics either.
Another thing, just for consideration, is that there are a number of species in the pangio group that can be sold as "black kuhli loach". Loaches.com is a great resource because you can find species by their physical characteristics rather than just by name.
125 - BGK, chanchito cichlid, pictus cats, silver dollars, palmas bichir
125 - cichlids (severums, bolivian rams, chocolate), rainbows ( turquoise, red), loaches (angelicus, zebra, kuhli and horseface), plecos (BN, RL and clown), denison barbs, tiretrack eel, pearl gouramis, betta
90 - Congo tetras, african knife, upside down cats, spotted ctenopoma, kribensis, delhezzi bichir
2.5 - betta