I've kept fronts for probably a dozen years and also have experience breeding them. Quality pellet is normally sufficient. I've used both NLS and Omega One (Color pellets and/or Shrimp pellets) with good results from both products. Mentioning fish food products often leads to strong opinions or arguments, but I've tested them thoroughly (as well as other products) and I like them both, get similar results from both. Both are good for color in fronts ime. Some people like to feed them treats of market shrimp or frozen products like frozen mysis shrimp. I prefer freeze dried, haven't fed frozen in years. IME freeze dried mysis can be a good growth food. Naturally, the other parts of the equation for growth in fronts are water quality, not stressing them out with the wrong tank mates, etc., and sufficient tank space.