huge cichlid

From your experience, what is the hardiest medium-large Central American cichlid you know of or have kept? I’m talking rock solid. A fish Resilient to diseases compared to others. A fish that is stronger than the others.

After keeping several LFS style dovii in the past( mutts) I have finally found some nice Costa Rican dovii off of a very reputable buddie of mine. I have gotten a male and a female and I plan to keep these fish long term... As in for their whole lives. They are in a 240 gallon 8x2x2 as of now. I...