Joe, if you find a warm day (where pond water temps reach near your tank temps), just move it! I sell a lot of pond fish that are going from my heated store, I just suggest that they pick them up when there's a warm window. And I've done it myself many, many times. The water parameters are likely more different/dangerous than temperature. Do a quick test of pH, GH, and nitrates first. If they are close, as soon as temp are within 10 degrees, float 'em! And I'm being cautious!
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Nothing good happens fast in an ecosystem.
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