This is also an option, IowaFish... Cons can do very well on cichlid pellets and flakes with an occasional frozen food supplement, but it should be worms/shrimp. These aren't real "guapotes" or piscivores with gigantic jaws that inhale fish like m&ms... They also need a green section in their food "pyramid" of vegetables.
Another thing to consider is when they breed (notice I didn't say if) then they will get added protein from the fry they devour as soon as another batch has hatched unless you take out the old fry. My single pair bred so much I gave up on trying to remove all the fry, and found I never had to as they got eaten by mom or dad pretty quickly. Unfortunate I know, but as cool as these fish are, they are not exactly "in demand" at the pet shops.