Compatability

[AJ_77]

Take it easy, dude. How about if Bob Fenner gives his 2 cents? Is an expert better for you?

quoted without permission:

Inter- and Intra-specific Aggression:

Purple Tangs are almost always fine tankmates as juveniles (under 3 inches in length). Often, growing up in under-crowded circumstances with other fishes, they grow to be the same as larger adults. As is often stated as a rule of thumb, this Surgeonfish is better not stocked with similar-appearing fishes, especially other acanthurids that occupy a similar niche. Those in the genus Zebrasoma especially. Under crowding is always the safest bet, followed by introduction of smaller individuals first; and more aggressive species like Purple Tangs as the last fishes to be placed. But there is no sure-bet with stocking this species. Careful observation is a hallmark of a successful aquarist.

(from wetwebmedia.com)
So in general terms you might be asking for trouble with this pairing, but yeah, you should really know your own fish too... I think the meat of the message here is " don't push your luck - be responsible."