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Is my turtle's shell turning black a sign of shell rot? What to do?

Updated On September 23rd, 2025

My turtles shell is turning black, and I'm not sure if it is shell rot. I don't know what to do.

1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on October 24th, 2015

Shell rot is characterized by pitting, soft spots, foul odor or discharge or loss of scutes. It can be a serious condition and requires veterinary attention. Your turtle may have rot or the discoloration may be due to excess mold or algae. Clean the tank, do a water change and change the filter media. Confirm proper environmental conditions for your particular species of turtle. Try using a toothbrush and gently scrubbing the affected area of the shell. Make sure your turtle has a warm, dry basking area with proper UVB lighting. If your UVB bulb is older than 6 months, replace it. Do not place glass or plastic covers between the turtle and the UVB bulb. Feed an appropriate diet and dust food with a calcium supplement once a week.

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