Gregcoyote
Aquarium Advice Addict
But the corals that have browned up are showing the best growth in my frag system. The lighting has a huge difference on this process IMO. But organic levels can also contribute. If you are growing Xenia, you have at least moderate organic levels, Xenia won't grow otherwise. If you polish the water to maximize SPS coloration, you are at risk of nuking the soft coral population.