Tang additions how risky

I recently added a purple tang and a yellow tang to a tank that has been set up for a year (if you are worried about setup). The tank is a 150 gallon. These two tangs were added at the identical time. They are both about 3.5 inches long. As I do reading on it I wonder will most likely they get along? Should I return one immediately? Today (the day I added them) they seem to be getting along togethor very well. Should I just keep an eye on them to make sure neither becomes a bully towards they other? That is kind of what I had planned doing but just wanted others people opinions on that. Thanks Michael
 
they will be fine. There will undoubtably be some bickering here and there, but until one really starts to beat the other up you will be fine. I've seen smaller tanks with a yellow and purple in it.
 
yes tangs will fight for awhile to show whos boss. they form a chain of command as i call it. Each one will have its place. good luck
 
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