Depending on what you use and what you've got on the rock, you can have success with many of the techniques mentioned.
But really, for all the time and money you spend on your tank and for what reefer rock costs, why screw around ?
It's the only way to be 100% sure.
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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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