breeding pair of cons. and maybe a small school of emperor tetras. i have done this at work. it lasted about 2 weeks before i sold the cons. the cons didnt bother them cause they were always in the nest and the tetras were always dwelling near the top. but thats not in your choices. i would say 1 con. and some serpaes! i hate kribensis. i never got into africans, i dont mind them, i just really dont like kribs.