All you got to do is look at a color wheel and pick opposite colors and that seems to do it for me! I have a bad habit of deciding what color coral I would like at a spot and then trying to find a coral in that color that fits my tank scheme(mixed LPS heavy, lots of wiggly things) I think it works well for me. My colors are all over the place but I seem to have balance I think. The nice thing about Zoa is they come in every single color imaginable. Someday I will have a 10-20 gallon with just Zoa and let them all grow into each other. Be warned though. The stronger will eventually take over and change how you placed everything so plan accordingly. The Utters pretty much took over but I am ok with that cause they are an awesome night orange