I have a male adult wrasse and want to add a harlequin shrimp but wasnt sure if the wrasse will go for it. The tank is a redsea 625xxl (160 gal). Currently the tank has one clown, dottyback, sunburst, gobby and shrimp and a foxface. There is also a peppermint shrimp. The melanurus was the most recent fish added and I have had no problem with aggression. The harlequin is to address a starfish issue before it gets worse.