Fally I'm setting up my 210 with 3x 400w MH as well that way I can grow anything.
What K rating are you going to use, this is my next thing to buy. My local store told me to have fast growth use 5500k or 10k if I want just better color of the coral is should use 14k or 20k. I want both!
anyone have an opinion on this or proven results?