Hi Chris,
10 degrees is a safe temp over night, so long as their night time housing is nice and snug, not drafty then they should be ok at these temps.
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Ade 
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Y.O.B 1971 (40 years young!  )
My Tortoises :- Dug (Testudo Graeca Ibera Terrestris (Syrian), Penny, JJ (JennyJack), Buttons and Gem (Testudo Graeca Ibera)
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