I have a Blue with my PBT and they get along fine, it more my purple that i worry about. I put my blue and purple in on the same day so there was no problem there. I got a PBT from the LFS that they held for me for a month or so, he then went into my 20g QT for a month so i could get him fat before i threw him in with the other tangs, the blue never touched him but i thought my purple was going to kill him, but its been 3 months now no issues they all swim together. This is in a 120g 4'x2'. I would add them at the same time, that should keep the aggression down and they will hopefully establish a "pecking order" without too much fighting.
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