I have only QT'd 3 types of wrasses that I can recall, but I only used sand for one of them. The rest I just put pvc pipes in them. Oddly the one I used sand for never acclimated to tank life and died. A coris wrasse. The others were a yellow wrasse, 2 six lined wrasses, and a very long time ago I had a Halichoeres melanurus. All were beautiful.