NLS is good for color, Omega One Color pellets are good for color, in some fish Omega One Shrimp pellets are good for color, just to mention a few. Some foods will improve overall color and the orange edge may widen with age, but the width of the gold/orange edge on fins or tail is genetic. Some foods might brighten up colors or make the edges a little bit more orange or reddish, but they won't make the gold/orange edge wider than genetics dictate.