Awesome photo!
So by herd Christy do you mean those three, or something larger like a shoal of PBTs? I would probably say you require at least 500g for a bigger herd, and of that 500 I would say most of it should be in length and depth. Look at oregonreef.com he has a shoal of regal tangs, and while they aren't the same as PBTs, I am kind of assuming thats the look your after?
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