Blue Hippo tang + Yellow tang in a tank?

Yellow and Purple could turn out badly, very similar body shape in a smaller tank, but people have done it.

These are both Zebrasoma genus tangs and I think 2 is asking for trouble. Oddly, tangs in this genus usually do well in groups of 3 or more, but not just two. I'd bet purples are getting hard to find, and more expensive; Red Sea shipments are almost non-existent because of the recent terrorist attempts originating in Yemen.
 
Please understand that I believe an 8ft tank would be best for these fish but that's going a little overboard. This argument has already happened enough so I'm gonna keep it short. It would be great if everyone had a 500 gallon tank but they don't. Do you know how many of these fish are doing great in tanks less than 8 ft. 8ft would be great but I think many would agree that 6ft would be fine. Either way 100 gallon is probably a little small.
 
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