Almost bought an Atlantic Blue Tang from Petco...

I stopped at Petco yesterday to pick up some bones from the dogs. I looked at the SW section as I normally do. They had a juvie Atlantic Blue Tang that's in the process of changing to adult. It was approx 3" in length and $49.99. I almost pulled the trigger on it. Can it be kept with a Yellow Tang?What to do? :grumble:
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