My Purple Tang chases my Mystery Wrasse every once an a while. He hangs out with my Majestic Angel. They're buds. He used to get chased by one of my Clownfish, but would always try to slap them with his tail. I got rid of my Clownfish pair because it was getting too aggressive towards both my Majestic and Purple Tang. They would stress them out. Never had problems with any of my corals, but my Majestic dined on my Mushrooms. No problems with my Toadstools, Colt, Zoas, or Polyps with my Purple Tang though.