besides the size is there an advantage to have one or the other your tank? The reason I'm asking is I was thinking to add one or the other to my tank in a month or so. I have clowns, cardinals, tangs, a royal gramma, a chromis and midas blenny in a 120g long. Would they prefer one over the other to eat?
I just don't want to be over ran by either one of them. Referring to Isopods or Copepods.