Kribs aren't Mbunas cichlids, like you originally wanted in your tank. I believe you said you wanted to stick to straight mbunas cause you're picky like that when told about the red in peacocks for color. Anyways they are from a River in Niger and shouldn't be with aggressive mbunas. Here's something i found
"Kribensis cichlids will work well in community aquariums with peaceful fish of the same or larger size, but avoid housing them with slow mowing species with long and flowing fins, e.g. Angelfish, since they may nip the fins of such fish. If you wish to house your Kribs with other cichlids it is advisable to avoid species that will compete for bottom supremacy with the Kribensis."
If you do decide to keep them then you want maybe some Ps. Acei that have a more gentle temperament. Wouldn't recommend any more than 3 species in an African cichlid tank of 36". It's ultimately your tank and you will do what makes you happy, but this is just a recommendation.
125g- Pseudotropheus Acei, Labidochromis Caeruleus , 2 Metriaclima Estherae Female, Sciaenochromis fryeri ''Electric Blue'' Maleri Island, Protomelas Taeniolatus "Red Empress" Male, Cynotilapia Sp. Gallireya Reef (White Top Hara) W/C + F1
40g- Wild Caught Cynotilapia Sp. Gallireya Reef, Demasoni Juvies, Acei Juvies, Red Top Trewavasae Juvies, Rustie juvies, Christmas Fulu Juvies, Pseudo Elongatus Chewere Juvies, Labido Caer Juvies.
20g long- ocellatus "gold", calvus "white" Chaitika