Not sure on temperatures but intermediate to warm seems ok. I grow mine in my living room. Probably yours is in full growth / flowering? As long as the plant has leaves continue watering and fertilizer. When the leaves drop stop watering completly temperature can be lower to (mine goes down to a 17 degree average day during dormancy). When the new shoot starts developing wait with watering untill the shoot is a few cm's long and roots start to develop (they are prone to rot if watered to early). I've read somewhere that a day night difference in temperature is neccesary to induce flowering. But I've never had problems flowering mine neither did any of the other people growing them. Once I saw dozens at a nursery who didn't want to flower they were imported plants don't know if that might be the reason.
The correct name is Thunia alba var. alba.
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Thunia marshalliana
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