I've never used it, but apparently Coral Rx works well as attested to in this Advanced Aquarist article: http://www.advancedaquarist.com/2009/4/aafeature2
If you try it, post back here; I'd like to hear what you thought.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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