If you can get 30 minutes of sunlight per day (make sure they
have access to shade so they do not overheat) and use a UVB
source like the Reptisun 5.0 inside, you will not have problems as long as they are receiving a good varied diet.

My turtles stay inside in the winter with a UVB source and
stay out all summer and they have never had any health problems.

Hope this helps
Linda

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