Yeah as kizno suggested, apistos would work well.
I have a trio (1m 2f) of apistogramma cacatuoides double red in my community with the pair of bolivain rams, stunning looking fish, especially the males.
There are lots of different variations of apistos, the most popular and easiest to find are cacatuoides and agassizis, although there are lots even more stunning which can be harder to find, and more expensive.
Andy