Here is a picture of my tank and its habitants. There is a lot of hiding space and some unoccupied terratory also for the Salvini if I get her. Firemouths terratory is at left, Blue Acaras are spawning and control the back side of the tank, and Sajicas are about to spawn in the frontern middle part. Currently no one has an established terratory on the right side. Could adding the Salvini work better if I wouldn't sell the Rainbow cichlids? I think that then the Salvini would be less likely to target the Firemouths.
Tank dimensions: 60x24x24 inches
A picture from a different angle. (Sorry for the spotty glass)