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What are these white chalky spots on my red eared slider's shell?

Updated On September 23rd, 2025

Pet's info: Reptile | Aquatic Turtle | Male

My red eared slider turtle has began to develop white chalky spots on his shell. Can you please help?

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2 Answers

Most Helpful Answer

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Answered By Todd Cecil

Veterinarian

Published on September 8th, 2019

Thanks for reaching out about Squirt and including a photo. The two most common causes of this are mineral accumulations with hard water and exposed bone. Mineral accumulations you should be able to scratch off with a fingernail. Water source might need to be changed to filtered water or commercially available spring water. Exposed bone is usually due to poor water quality (high bacterial or algal loads) that erode the keratin layer. Water changes need to be made more often, but a veterinary visit is recommended as systemic antibiotics might be required. Good luck.

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    Answered By Todd Cecil

    Veterinarian

    Published on May 12th, 2020

    Thanks for reaching out about Juanita. This is often a result of hard water (high mineral tap water). Can the white chalk be gently removed with a fingernail? Check your local pet store for water additives that could soften the water. If this is due to hard water, there is little harm to Juanita. If the shell is soft or your unable to remove, a veterinary visit is recommended to assess and provide a diagnostic/treatment plan. Good luck.

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