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Does my slider turtle need UVB light even if tank is by a window?

Updated On September 23rd, 2025

If my juvenile slider turtle tank is next to a window, is UBV lighting nessesarry? (This is a wild turtle). And if it is a must, how long can they go without a UBV? (I'm am sending pics so you can see how far the tank is from the window, if you need it)

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on March 19th, 2018

This will not provide sufficient levels of UVB lighting. The window and tank glass will block a large majority of the sun's beneficial rays. A UVB light source must not be blocked by glass, plexiglass or fine mesh and should be about 12-16 inches from the surface of the basking area for maximum effect. Without UVB lighting, a turtle cannot properly synthesize adequate levels of Vitamin D3, which is necessary in the absorption and metabolism of calcium. The result will be metabolic bone disease, soft shell and/or stunted growth.

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