Question is regarding an aggressive 3 inch blue hippo tang in my saltwater aquarium. The aquarium is 163 gallons. I added a new female watanabei angelfish to the tank. The hippo tang became very aggressive and has attacked the angelfish nonstop. The hippo tang has never shown any aggression in the tank since I purchased it 4 months ago when it was only about 1.5 inches. I was able to separate the fish but the angelfish was left with some scratches and torn fins. I put the angelfish in an acclimation box for 3 days. I also dipped it in some seachem Stress Guard which seamed to help heal the fins remarkably well. I released it back in the tank and used mirrors to distract the blue hippo tang. This did not work and the blue hippo tang started to attack the angelfish again. I now captured the blue hippo tang and put it in the acclimation box. The angelfish is doing well in the main part of the tank and eating great. What do I do next? I want to safely release the hippo tang back in the display tank but I am not sure how long to keep it in the acclimation box and not sure if the aggression will subside on its own. The hippo is pretty restless in the acclimation box.