In the refugium, you NEED to give it some "dark time". You need both the Krebs Cycle (photon) and the Calvin Cycle (enzyme) to have healthy macro. Many people had problems with this when using caulerpa because it would go "sexual" on them during the dark phase and ruin the water. However, with proper pruning and care, this shouldn't happen. Furthermore, if you use Chaeto, it will not happen. But the bottom line is, you should have an equal (approx 12 hours) dark and light phase for the fuge too.
Dave
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
