When I purchased this Acropora nobilis, it was brown with purple tips. As soon as I put it in my tank, it appeared green with bright blue tips (due to the lighting difference between tanks), and continued to do well in my tank. It encrusted to the rockwork, and is a beautiful addition because of the staghorn structure. I tried to give frags to multiple people over a two year period, but no-one was able to keep it alive. Sadly one day, I lost my own colony. One of my favorite corals, and I'd love to find another one one day.