I have had Jewels with Raphael cats, Blue Phantom pleco, and Orange seam pleco.
Jewels pretty much leave bottom feeders alone unless it gets close to it's nesting area.
Like others have said, don't mix Jewels with African lake cichlids, they are from the rivers and like near same water as SA/CA cichlids do, not the really hard water of rift lake cichlids.
They are a smaller fish females get around 3in males 5in. So you can easily have another fish with it like an Acura, or Convict. I bet it would get along with a Poly as well, so long as it's a smaller one and can't eat the small cichlid.