I have one and also had a similar scenario. It would be a shame to have to part with one of these awesome tangs.
I just totally rearrange the rockwork in the tank and this puts everyone on a level playing field again and really reduces or removes the agression. You would probably have even greater success by changing the aquascape and allowing the new tangs to settle in to it for as few days and then add the sohal back into the main tank. This has also worked for me in the past with other tangs as well, whenever I found the original occupants being aggressive with the new additions.
Just something to consider if you have any interest in keeping this fish.
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