I have a rare zebra Tang and regular powder blue tang that are both around 4 inches. Coming from the same family, it could be tricky adding them to my 9 foot 800 gallon tank. They will go in together and last. What do you think are the chances that this will work out. They are both pretty aggressive in their own right. In fact I had to separate the zebra into the sump of my QT/holding tank while I condition fish for the new build 800g. He was going after the Yellow tangs with allot of aggression. PB is in separate QT tank for now