Hey... I have the 36" version of that light. I have 2 Blue moonlights and I think I'll be adding 2 more eventually. Tank looks realy cool at night, but only the section directly below them get's illuminated(sp). Which moonlights are you going with? I bought the Current ones and they are quite hard to mount on that fixture. I ended up using Doublesided tape for now.
I'll snap a picture tonight if you want to see how mine looks with 2moonlights.
I can't advise on which color to go with, That's more a personal choice. My Uncle has a white moonlight on his FW
tank and I really like the blue better.