They want to be together to probably kill each other. Unfortunately these are fairly difficult to keep and are ich magnets. I have seen pet stores hold more than one juvenile together in holding tanks but have never heard of anyone keeping them together successfully. If they are only now showing aggression, it will only get worse from here and even in a large tank (125g) they will chase each other till at least one dies (if not both from stress).
Your best bet would be to return one and get him a nice buddy, mine was a big fan of the yellow tang and my majestic angel for years.
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