About a month ago I got a yellow tang for my 65g tank. My tang was very peaceful with my other fish at first then started to become aggressive. On the left side of my tank is a cave, any fish who tried to go in there my tang would scare away. One morning I woke up to a dead clownfish. I don’t know whether that was the tang or a coincidence, all I know is that my clowns liked to sleep in the cave at night. About a week or 2 later I got a new clown and an coral beauty angel, the tang would always whip out its little knife near his back tail and use it to attack the angel. There was an ich breakout killing the angel later on, all my other fish were fine. After the ich subsided I got another angel, a flame angel. I carefully watched my angel to make sure it wasn’t the Bully of the tang but like the coral beauty angel the tang would attack the angel if he got anywhere near the cave. A couple days later, I found the Angel dead. My tang has been aggressive to my clowns, angels and even a bit to my shrimp. My tang is only peaceful with my 6 line and cleaner wrasses. Is it normal for tangs to be aggressive? Is there anything I can do, should I get a different yellow tang or have no yellow tang at all?