mysis shrimp are not that expensive you can get them at your LFS. most of your corals will get all they need from just the water and the light. but some you want to target feed just to make them grow quicker and make them happy (acans, moon, openbrain, blastos, candycane, sun) I am like ReefAngel. I love to feed my babies. I just like it when they are fat and happy and it helps quicken the growth.