I bought a Melanurus wrasse along with a McCosker and Exquisite on Friday from a Pre QT vendor. All acclimated fine and everyone ate Saturday and Sunday. Monday and Tuesday the Melanurus hid in the sand. This morning I found him laying on top of the sand on his side. He has no visible signs of disease or parasites. The tank is cycled and has a pair of clownfish (also QT'd) that lived in the tank for over a month before introducing the wrasses. Tank is 180g system volume. Not detecting any ammonia and nitrates are at 25ppm and phosphates .1ppm as I've been battling dinos. Please help.