| Re: 4 or 6 T5's? I'm running the Tek 4x39w fixture on my 18 wide softie/lps reef. All the corals are doing great. I had some sps in the tank that showed great color and PE, however I have so many leathers now that the chemical warfare wasn't a good thing for the SPS so they have been removed.
The 4 bulb works great with the center overflow, I keep the lights slid forward in front of the overflow to minimize the amount of light that gets into it.
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