Advise on tank bully

[NightShadeFairy]

Hello
So bully update, I came home from work today to find some interesting dynamics beginning to unfold, my other two tangs ( Regal and Naso) a well as my Regal Angel have formed a sort of support team for my new Yellow Tang, who is certainly the smallest of them)
They seem to have formed a bit of a club.. They all swim around together.. Sometimes in synce.. And when the Clownfish starts to pull rank on the YT, (who doesn't seem too concerned btw) the other tangs and angel start defending him and protecting him!! It's so cool!! I would also like to ad that my clownfish has never done this aggressor act with any other fish.. I am wondering if it is because his (the clown's) fins are bright yellow.. I am wondering if perfaps that color is the trigger for him? The fact that the new tang is yellow also? Same color of yellow as the clowns find in fact.
Just a momentary musing..
Regardless, I do know the other tangs and angel are certainly helping out the YT in a manor thT I have never seem before. When I had fresh water Frontosa Chiclids the larges one of the tank woul interviene if the second larger would start bullying other fish.. The boss woul always break it up, but I have never seen a group of fish work I a common purpose, which is the defending of a fellow tank mate. Soo very interesting and cool!!