Poor Six LIne

Sand Panda face.
As someone noted above there sure are a lot of Six Line threads this week - lol. Not making fun of your plight but there are. Six lines are great if you have an environment that can support their habits. In your case it wouldn't work with the other wrasse and the tank size. I swear they are worse than tangs by using up every inch of the tank, rock, coral, rubble, and empty shells looking for food.
The yellow is bright, splash of speed, and will be happier - much to the six lines unhappiness