You don't need a cleanup crew in an African tank - the cichlids don't leave anything behind. You have the option of bottom feeders, but get them because you like them, not to clean up - they'll need special attention and will starve to death if you don't feed them directly.
If you have mbuna the bottom feeder diet is very meaty, so you may need to feed them at night, once the mbuna settle down. I'd never use a pleco in the mbuna, who are avid algae grazers - it removes a large part of their natural behavior when you remove the algae.