The only way to tell if it is a scam or not is to ask him to let you pick up and pay for the fish in person. Seeing is believing. It's most likely a scam.
If it wasnt a scam most of the members of this site would have asian aros at that price. You did the right thing by asking everyone. You can tell its a scam because he wants you to act fast.
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Far as I know they are no Aro farms in FL carrying AA's.... Illegal in the states. If they weren't I think most of the US members on this forum would have a bunch already...know I would!