Well, as you know I painted the 65 and 40 black and the overflow boxes are black and the returns are black. You really have to look to see them, I am happy with the way it looks. Your overflows are black as well, I would maybe considered going with a black background. I always think that the live rock is the focal point of the tank. Even my FW planted tank is all black and when you look the background looks endless. JMHO I am sure what ever you decide will look great. Just remember that Fusion krylon comes in small cans and you can use a small cloth roller to apply it. Not that I am trying to convince you to go that route.