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My name is ***** ***** I have been a Vet tech for 30+ years and have worked with Reptiles for over 40 years.
I suggest that you changed to a bottled spring water in the tank. Once the water is changed the build up will soften and the turtle will be able to shed the lime build up. You can use a soft tooth brush to help loosen the build up, but do not scrape the shell. You can also use a shell conditioner. The big issue is the hard water and the ph levels in the water causing the build up.
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