I have a 6" Purple Tang with 2x 4" Gem Tangs. Get along fine, I think they calmed the Purple down. I would advice odd numbers and different sizes. Maybe give your Purple Tang a chance. you could always catch it with a fish trap.
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Both are relatively docile for zebrasoma -- but Gem certainly more docile than black, IMOAren't both of those zebrasoma? And a common color to boot, seems risky to me.
This sounds about right for a black tang.I managed to grab mine at $480 shipped
Agree, as long as you can keep water quality high with all those dirty tangs!I've got a load of tangs together and always have. The mirror thing works. And with tangs if your tank is big more is better