Originally Posted by cmor1701d
I just realized that fixture came with the 20k bulbs. I believe the 20K bulbs have a much lower PAR rating than the 10k bulbs do. Not sure how much of a concern that might be, but it might be for clams on the bottom. Maybe time to buy a meter too and test a few different bulbs. For a frag tank I would think that 6,700k or 10,000k would be the way to go for growth.
You'd lose all the color in your frags with 6700K bulbs.
If you want to maximize growth then color, then grow with 6700K bulbs then color them up with a nice 20K bulb.
Otherwise, I'd stick to a 14K bulb for a mix of growth & color. The Phoenix bulbs are a nice choice IMO