the intensity of the 13000k megachromes would put a stomp on the 15000k coralvue's most definately, no question about it
I have similar issues with coraline not growing when my halides are on. So in turn I've turned off my halides for about 2 weeks now and coraline is taking off like a weed with only VHOs running. I've also been adding baking soda and calcium in quite heavy doses to help it grow.
So in conclusion, Blame the halides
