I don't suggest getting any fairy or flasher wrasses as long as you have a six line. Six lines have a Napoleon complex that doesn't go well for fish that are easily dominated. You could try the yellow coris. There are more halichoeres wrasse options too. As an alternative to the blue star, ornate leopards are feistier and can handle some chasing better than blue stars. Whatever you decide to get, I recommend adding more than one at at time it'll curb potential aggression if they're not singled out as the new guy. Using an acclimation box to introduce them into your DT helps too.