Question about changing MH ballast

[daniella3d]

Most important thing for the yellow is lack of nitrates and phosphates:

I have no problem keeing yellow under my 250 watt 14k MH.

http://reefbuilders.com/2008/09/03/g...-vivid-bright/

Originally Posted by Casey8

You are lucky with your corals, I have 2x400W with 2 actinic but all my yellow sps corals are still turning green color, I just can not keep them yellow. I have googled and found out that it is because I don't give enough light for them I really don't understand.