So I been thinking... I see different kinds of fish food (pellets, flakes, live food, etc.) for sale from different companies with different ingredients. Which ingredient specifically enhances colors in fish? For example, is it the protein % or spirulina or whole fish? A perfect analogy of this is dog food. You get what you pay for. I feed both of my dogs grain-free and their coats are soft and shiny. I don't want to feed my dogs the food made by Pedigree or Purina, that is full of fillers and by-products. The same goes for ANY pet under my care. Fish food doesn't seem that expensive compared to dog food so I want to feed the best brands out there. So far from my research I have found that top brands include New Life Spectrum, Omega One and Hikari.