I have both types of tangs together in the same tank, but its a 6' 210g reef. The PB only goes after other PBs, just like my Regal only chased a bit after other Regals & my school of YTs go after newly introduced YTs.
My Powder Brown tang, on the other hand, attacks everything new that is placed in his 120g fowlr.
For the Powder Brown, I have a hang on tank plexi box that I use to keep the new fish in until the PB gets used to it. Then I release & it's no problem.
Anthony
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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