I have a Red Tail with @ 30 Africans in a 90 and I never have a problem with the cichlids bothering the RTS. If anything its the other way around. The alpha cichlids complerely ignore the RTS, and the Red Tail will chase around the more passive cichlids when they get in his way.
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I agree with Amonra 100%. I have had a red tail with aggressive mbunas for over a year never had a problem besides the RTS chasing the more passive fish around.