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Id leave it at the lavender tang. To similar looking to add a yellow eye kole tang i think. Would definately have aggression issues. Have you thought about a foxface? Or some basslets?
I wouldnt put two tangs in that tank. Both tangs you listed are suggested a 125 minimum gallons. And a 92 corner is shorter then a 90 long rectangle. A tangs suggested necessary swimming space is 6ft. I would just stick with one tang.
I bet! Put some smaller fish in such as some wrasses or basslets, maybe a pipefish a whitetail bristletooth tang or kole tang would be the only other options