Reef Flakes too coarse for a wrasse?

Hadn't really given much thought yet as to what specific wrasse as I'm still working out a stock list for the re-birth of my 75. My initial concern was the coarseness of the substrate and the burrowing behavior of wrasses.
 
My H. cosmetus has been in my tank with reeflakes for several months now. There do not seem to be any issues. It sleeps in the sand each night and has no wounds or abnormal abrasions as a result.
 
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