heres some more information Restricted Species.
Clown Tang - Acanthurus lineatus
The Acanthurus lineatus grows up to 15 inches. The small size will come to you generally 1½ to 2½ inches; the medium generally 2½ to 3½ inches; the large generally 3½ to 6 inches; the XL generally 6 to 8 inches. The Clown Tang prefers a tank of at least 150 gallons with plenty of places to hide & swim. The Acanthurus lineatus is a herbivore and likes to eat marine algae, zucchini, brocoli, mysid shrimp, Spirulina, lettus, seaweed, sponges, and other meaty treats. The Clown Tang is a medium maintenance fish and may act peacefully toward other fish. It doesn't get along with other tangs. Keep with caution in a reef aquarium. Filters pose a threat to the planktonic offspring. Acanthurus lineatus (Linnaeus 1758), the Clown, Pajama, or Oriental Surgeon. Though this is a commonly used species when small, this fish can become an unholy terror towards its tankmates, getting progressively worse with growth. Keep water quality high (SG 1.020 - 1.025, pH 8.1 - 8.4, Temp. 72 - 78° F). The Clown Tang is commonly collected from Fiji, Maldives, Sri Lanka.