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Knutson's in Brooklyn had them last year.
Always wanted to use them in winter, but can never find them in WI either. Have you or anyone else tried to keep them alive in a tank long term?
Well they are fussy. Biggest thing is fresh water. But they don't like to be submerged in it.
Wigglers natural habitat is in the "mud" of lakes and streams. They are always under water. Not quite understanding your comment of they don't like to be submerged.