Our red slider turtle has a large amount of green mold growing in the cracks of her shell. Is this dangerous? What should we do about it? Thanks much.

Updated On November 3rd, 2017

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

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Use a soft bristled toothbrush and some diluted Betadine or chlorhexidine solution to gently scrub the shell. Do this daily and dry dock (keep her out of the water) her about an hour or two after each scrubbing. Check water quality and filtration. Rinse filter media with tank water and perform a water change (20-30%) if necessary. Make sure the filter is producing a moderate current to prevent stagnation. Use a timer to limit the photo period to 10-12 hours daily. Adjust the water heater if necessary. Too much light and heat can cause algae overgrowth.

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