I'm thinking about putting a dragon wrasse in my predator tank. The tanks current inhabitants are a huma trigger, a velvet damsel, and a snowflake eel. The tank is 120 gallons. My main concern is that I DEFINITELY will be adding a harlequin tusk to the tank as well (which is also a wrasse), and I'm worried about possible aggression. Nothing I have been able to find online suggests that there should be any problems. Thoughts?