Is it the first Cirrhilabrus you are addiing to the 180? If so I would wait to add last of the wrasses if you really want it or return it. I would not add it first and then add others.@evolved, thank you for the ID. Unfortunately, it looks like I made a mistake based on your compatibility chart. I have a McCoskers flasher as well as the C. Filamentosus in my acclimation box. I was hoping to add a couple of other flashers or fairies to go into my 180 gallon tank as well. Since the filamentosus is aggressive, should I take him back? What would you do?