Thanks for the quick reply, Reefhawk1. Some people are using something else and I didn't check with the forum before I started to set it up. 
I also had some tiny hermit crabs in the fuge til I noticed they were eating the caulerpa.  
They're in the display tank now.
Thanks.
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Mike
90 gal. FOWLR, 25 gal. Sump/Refugium with Chaeto Macro, 60lbs. Live Rock, Q.O. 6000 Return Pump, Wavysea Wavemaker, Aqua C Urchin Skimmer, 2-VHO (1-super actinic blue, 1- actinic white), Icecap 660 Ballast, Auto Top Off System, 2 Clownfish, 1 Brittle Star, 20 Hermit Crabs, 7 Small Mushroom Frags (attempting a mixed reef).
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