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Yes, but it might take them a while. I put some ghosts in with my jewel. At first the jewel was afraid, and was actually chased out of his favorite hiding spot. Later he became curious and figured out that the shrimp fit in his mouth, a quick suck later and I was left with an empy shell of a head. The jewel then proceded to do this to the rest of the dozen.
I agree that they'll be eaten, although they're cheap enough to give them a try.
I had a rather unfortunate incident with trying to use black phantom tetras as dither fish in my cichlid tank. I thought they were too big to be eaten. I was wrong. They disappeared (and I mean DISAPPEARED) at a rate of one or two per night until I pulled the remaining two out and moved them into a safer environment.
Depending on what type of Africans you've got, you may want to be really careful about feeding too much live foods. Mbuna need a diet consisting of mostly vegetable matter: too much live "critter" proteins can lead to Malawi Bloat.