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Carlos,
[welcome]
There's not really a correct size as such. You don't want the tank to be too small as it may stress the fish, but you also don't want it to be too large as you'll need more medication and more water for water changes. A 10 gallon tank would work, but is a little small in my opinion. A 20 gallon would be the smallest that I would recommend but I believe a 30 or 40 gallon tank is the best - especially for tangs.
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ATJ
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