**I would NOT expose grandis to 55F / 12 Celsius for more than a few hours.**
Environmental stress during the cool / dry season in natural range can drop to that temperature at dawn, but air temp will climb back to over 80 by mid-morning, and animals will hide from drought / cold stress in remaining waterholes or deeply buried in root tangles / brushpiles etc, where temp is unlikely to drop below 70F for any length of time.
Treat the animals like you would treat a Rhinoclemmys, NOT like a Wood turtle or Terrapene. SE Asia is not quite like West Virginia....
Hope this helps.
I keep my pair indoor in Winter at 28C and they seem very happy.
Going down to 55/60F may lead to weaken immunity and illness. I would not take that risk!
Gui Zeen Yan.
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