Curved up shell on mum's terrapin

Today i noticed one of my mum's terrapin got its shell curved upwards! Its as if i could feel the pain he's suffering! Did a quick search and realised this could be due to the lack of direct sunlight and calcium and if not treated might cause death! Mum paniced! Now cleaning them up and moving to a new house i bought from Ikea. Going to place them under direct sunlight. Hope it recovers.

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