Just to clarify, below is a female motaguense, note the lack of spots on the gill plate and lower jaw.

That said, it might not be as dramatic for what was once dubbed loiselli (now dubbed either friedrichstahli, or multifasciatus depending on who you talk to), (because the name loisellii is now considered invalid as of 2018)..
Females can be as aggressive as males.
In nature they eat insects., and fish, so a pellet made for carnivores is your most healthy bet.
A friend kept a full grown pair in a 150 for life, that spawned many time, but no other cichlids, or fish.
I have kept a number of Parachromis pairs in 6 ft tanks, but only as pairs (not dovii of course, they need much larger tanks), but even as pairs they needed to be watched closely, and divided if the females became abused.
As far as plants go, floating plants or terrestrials with roots in the water are probably your best bet.