Is this the same tank that is having the ich infestation right now? If so, the answer is obvisously "no". Hippo tangs are amoung a small group of fish that are considered "ich magnets" in this hobby. They are great fish, but require a lot of swimming space to remain happy and stress-free. I noticed in your other thread you said you had a 50gal tank, this thread refers to an 80gal. Just making sure we are not refering to the same tank. Anyways...a 50 or 80 is still a bit cramped for a hippo. I would skip it.
Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs!:p
Have a great day! Brian