I have never seen my Rainbows so full of colour!!! It is amazing what that food does. They are healthy, happy. What I love about those flakes is that they don't fall apart/dissolve and pollute the water like "traditional" flakes.
Not only do my fish seem to love this food, I like the circlular shape of the flake as it seems less messy than normal flake foods. Prior to feeding this, my fish were already displaying bright colours so i'm unable to comment on the 'colour enhancing' potential of the food.
I had a sample of this and was amased at just how enthusiastic my tropical fish were for it. They had only ever grudgingly eaten flake food before. They were as excited about this as they are live food. The small size is also ideal for my tetras, dwarf guoramis and clown loaches.