I'm surprised you haven't had issues with the scopas and pbt. What size tank? How long have the two existing tangs been together?
I'm also concerned that you have lost a pufferfish and a humu trigger lately. I would slow down on adding more fish until your tank become more stable.
*edit* I see that you just recently added both fish and the tank is fairly new. I urge you to slow down and not add more fish until your tank matures a bit.
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