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I'm sure that light does effect them somehow I don't know for sure. What I can tell you is my Redfoots feed just fine without UVB. My Tortoises aren't outside full time. They spend the days outside in the summer and come in at night. It does get chilly here in the winter and they're indoors for...
Wow glad you caught it. I had a problem with a UVB bulb when I first got my tort too. Things like this is why I chose not to use artificial UVB. I'm lucky enough to live somewhere my torts can get natural sunlight most of the time.
Just a couple hours a week outside in the sun and you really don't need a UVB light. My youngest Redfoot is a little over a year and I've not used any artificial UVB at all. You can get by with a regular incandescent bulb indoors.
I think at 4 years if the plastron isn't concave, and if you haven't seen the "Tortoise junk" come out during a soak, then it's probably safer to say Artemis is a female. I agree with @ZEROPILOT maybe some kind of nasal deformity.
@TechnoCheese if it were me I would definitely leave a gate open so he can get back to his night box if he did get out. I'd bet money if he's not too cold he would eventually come back. I got my fingers crossed for you. I really hope you can find Curtis!