This is some info I found in live aquaria.com
The Clown Tang, also known as the Clown Surgeonfish, Lined Surgeonfish, or Blue-banded Surgeonfish, has horizontal blue striping on a bright yellow to orange background. It also has large peduncle spines.
A 150 gallon or larger aquarium is necessary to provide plenty of swimming room. It requires very clean, properly oxygenated water. It is aggressive towards other Tangs, Surgeonfish, and fish with similar body shapes or feeding patterns.
The diet of the Clown Tang should consist of algae and vegetarian items such as Spirulina, zucchini, broccoli, leaf lettuce, and dried seaweed.
So if you have 8' you could try one out.