Think of it this way, will eating meat/potatoes be enough for you all your life? Mix their diet up as best you can, no one thing can offer them all the nutrition they need. I'd LOVE to get my Cichla on pellets but I really haven't tried yet. I feed mine a mix of tilapia filet/salmon filet/bloodworms/live. And even with feeding those 4 things, I still don't feel like they're getting a varied enough diet. They refuse to eat krill, haven't really tried much else with them.
The moral of the story is vary their diet as much as possible, just think how many pellets it'll take to fill a 20" pbass up, once they hit 8" or so, they really won't even eat bloodworms anymore as they're so small to them...