Ehhh, I don't 100% agree with the murderous krib idea. Heh, not from personal experence because every pair I've ever spawned was bat-crap crazy to everything else. But I've read from other people that they've had kribs spawn in tanks with other fish and that the tankmates be OK. So it can happen, but it does seem to be in the minority if not in a large tank.
Now this would depend on a few major factors: The personality of the kribs. Every cichlid can have a different personality as to if it has a tendency to be more aggressive or more docile than the 'average' of it's species. All cichlids become more aggressive during spawning. The size of the tank. The larger the tank, obviously the more hiding spots the parents/fry and tankmates are going to have and be able to get away from each other. In a larger tank other fish will have a better chance of getting away from ticked off parents. Amount of tankmates. If the tank is over crowded, then fish are going to die.
Just some things to keep in mind
Cichlids are crazy things, but are more addictive than crack.