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I don't know about the brown spot, but the silver scales could just be normal coloring. My red wal mart betta had that silver coloring on his chin and some silver rays in his fins when he swam in the right light. It was so pretty. He died not too long ago, but it had nothing to do with him being a wal mart fish, he was just an overzealous jumper and hurt himself too bad. ):
Honestly, I think it was mean of your sister to say your fish would die because of where it came from. If he wasn't ill before, I don't see why she would say something like that. Maybe to help it live longer, you can tell us about your tank setup for him and how his health in general is and we can give you some husbandry advice. Good luck with your little boy, by the way! He sounds very pretty. :3
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