Birdnest's weird lighting requirement!

[gregzz4]

Both of my birds nest colonies, brown w/purple polyps and white w/green polyps, turned bright colors and grow like crazy now without nutrients
Lots of GFO usage and they look great

I don't have tubs ( don't know what you mean ), but I've found the best results with my birdsnest that were brown was to reduce my tank's nutrients

Brown birdsnest usually means high nutrients ... HTH