Yes as Ashley said, you'll have to ask. They might, take, but not buy them because they would want to quarantine for a while before resale and that's costly.
To be honest I doubt they would take the tank because of the small size and the goldfish are probably the cheapest fish in the store. But you never know unless you ask. They were going to swap me for my pleco who was too big for our tank. That surprised us and they're really great people to deal with and are knowledgeable and very friendly.
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