My mystery took out 17 other wrasses that were in the tank before him, and all others I tried to put in after him. Only 2 wrasse he left alone were the possum & the 4 line. This in a 155 gal. tank...
You cannot tell what the fish's personality is going to be until you have already placed them in your tank.:happysad:
Mystery wrasse are aggressive. There is also a post on here where a yellow choris is beating all other wrasses in a 75G tank. If you want to mix wrasses the best bet if to go with fairly wrasses.
Even in fairly wrasses there will be a hierarchy but not as bad as others.
+1 in what was mentioned already. If you do decide to add another wrasse you may want to try an acclimation chamber. Sometimes they only harass them for the first couple of days, but by that time the new fish is already beat up and usually doesn't survive.