Why is there green algae growing on my red ear slider's shell?

Use a soft bristled brush to gently scrub areas. Heavy deposits can be scraped gently with the edge of a spoon. If you can treat the water, that may prevent deposits. A bit of algae growth may also "soften" the water as will powerful filtration. A filter rated for 3-4 times the volume of the tank may remove enough minerals to decrease accumulations.

Thanks for reaching out about Lio and including photos. The pictures don't show any concerns except maybe some algae growing on the shell. This might be an indication of poor water quality. Test and correct water quality problems. For optimal growth, red eared sliders need to kept at a specific temperature range for optimal growth. Good luck.

Thanks for reaching out about Abby and including photos. She does appear to have a good amount of algae on her shell. Test and correct water quality as high phosphates and too much lighting are often culprits. The shell can be gently scrubbed with water or a mild soap (Dawn dish soap) and then rinsed. Keeping her dry for prolonged periods of time can kill the algae but if water quality not corrected, problem could re-occur. Good luck.

UVB lighting is critical to shell and overall health. If you don't yet have a UVB light source, you can take Jazzy outside in full sun for at least 60 minutes daily. Use caution to prevent overheating though. Perform a partial water change (30% total volume) and scrub and tank furniture. Confirm the filter is rated for at least twice the volume of the tank. You will likely need to perform partial water changes weekly or every 2 weeks to maintain water quality. Turtles eat and defecate in the water, so it can get dirty very quickly without regular maintenance. Scrub Jazzy using a soft bristled toothbrush and a diluted Betadine or chlorhexidine (Hibiclens) solution. Allow for a 1-2 hour dry dock (out of the water) after each scrubbing. Monitor for lethargy, loss of appetite, soft spots on the shell or pitting. These are symptoms that should be addressed by your veterinarian or a vet experienced in treating reptiles. You can review slider care at the link below. http://www.anapsid.org/reslider.html

It could be some minor shell rot. Use a soft bristled toothbrush and some diluted betadine or chlorhexidine (Hibiclens) to scrub the affected area once or twice daily. Allow for a 1 hour dry dock (out of the water) after each cleaning. Maintain pristine water quality via filtration and regular partial water changes. If the spots do not resolve or if they spread, have Squirtle physically examined by your veterinarian or a vet experienced in treating reptiles. A UVB light source, calcium powder and multivitamin will promote shell health. You can also float a piece of cuttlebone in the tank for him to munch on as needed. It will provide additional calcium. Find the cuttlebone in the Bird section of the local Petco. The link below will provide additional information regarding the care of sliders. http://www.anapsid.org/reslider.html

Retained scutes may be caused by poor husbandry. Confirm adequate water quality, temperatures, UVB lighting and nutrition. Make sure the basking area is completely out of the water. Add foods high in vitamin E and calcium to promote shell health. Limit protein as this can cause rapid growth and lead to pyramiding. Monitor for signs of infection such as soft or pitted areas on the shell, fungal/bacterial growth, bleeding or lethargy. The following link will provide more information regarding care and husbandry of sliders. http://www.anapsid.org/reslider.html

There are many different things that could be causing these symptoms. It is hard for me to say too much about it without a photo or examining him myself. 1. shell rot 2. fungal disease 3. shedding (normal or abnormal) 4. mineral deposits I suggest you take Flash to a reptile vet for an exam so you can get a diagnosis and the proper treatment. This article may answer more questions for you: http://redearslider.com/shell_conditions.html Best wishes.