@Psycho
Yuo have the same worry that I have, I think that in winter, above all at night there will be the possibility that the external temperature of the atmosphere comes down under the 0°, and considering that my colony is still probably in the test-tube...im not sure how much isolation maintains the polystirene box...., my second chance is cellar, or fridge where im sure that the temperature is 5°-8°c....
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Max

