Where did you read that? Its not about gallon size when picking a tang, the thing that counts the most is if the tank is 4 foot long or not. If its not 4 foot long then that wouldn't make a good tank for any tang.
No Prob, also I want to point out that the lots of rock thing doesn't count either. If you had a large tank then you would less rock so he had more swimming room. Just pointing that out also.
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