A word of warning about regani (or any Maskaheros, one of my favorite genera)
I had a pair of regani in a 6 ft tank, until the male killed the female.
So I gave him to a friend with a 250 gal, that already had a 14¨ managuense and a 12¨red devil.
the regani killed them both in 24 hours
I'm set for a single jag with Nicaraguans, maybe a vieja species down the line, "maybe".
But I do have my 7-8 inch male parachromis multifaciatus I can build around him. I ended up rehoming the female. If I was to build my male, I wouldn't know what to place with him.