I kept a group of about half dozen, sold as ornatum.
As 1" juvies, I put them in a 55 gal to grow out, and they were very aggressive with each other in that tight space, so I added some lemon tetras as dithers, but that didn't help, so I added some similar size bellicose Guianacara, and this immediately suppressed the infighting.

At 3 inches I moved the group (Mesoheros and Guianacara to a 150 gal

They spent a few years in that tank until when I moved and gave them away.

They can be jumpers. They come from rivers that begin in the west side of the nearby Andes, and in doing some research on water temps, and parameters found them to average mid 70sF temp, so my tanks were heater less spring thru mid fall, and only slightly heated in winter. Moderattly alkaline with medium hardness, and pH was up above neutral compared to Amazomian rivers, so they did well in my 7.8pH 250 ppm hardness, 100 ppm alkaline water that originated in Lake Michigan
My alpha male among the group of mostly females was the most striking.