As omnivores they also like veggies like peas and spirulina flake. Frozen brine shrimp and mysis are good supplements too. They can be mixed with severums, but it takes big tank to do it - sevs get pretty large and cichlid need their space. Fronts are much different, from a completely different biotope. They're also big fish that need lots of space.
Let the fish grow at a natural pace. Overfeeding and overindulging in meaty food will get it growing quicker, but it will also take a toll on it's long term health and lifespan, and somtimes it's looks too.