I have a hammer that when I got it, it was white. Put it up high in the tank under 130 PC, stayed white. About 3 months later moved some rock around and moved it down lower in the tank. It is now a very dark green with pink tips, has split heads and is growing like crazy. I think it was up to high even for PC lighting, because as soon as I lowered it, it started to color up. I know some people think that you can only have corals under Hali's, but mine are absolutely beautiful and growing like crazy under my PC lighting.