Ive had melanurus and other halichoeres genus wrasse with my coco worms and feather dusters at no detriment, but some people report having issues where they would nip and bite at them.
Theres always that chance they will as fishes taste and personalities vary. I think adding the melanurus gives way to that type of risk and you cant know 100% unless you try, I had a positive experience but many have not.