I know people that would squirm about buying a fish in Walmart, but yes it could be a possibility you introduced something into the tank from these fish.
My suggestion would be... give it some time, keep doing some partial water changes and keep an eye for anything else unusual in the fish behavior etc.
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My suggestion would be... give it some time, keep doing some partial water changes and keep an eye for anything else unusual in the fish behavior etc.
Sent from my iPad using Aquarium Advice