I've had Scooby for several years. However, we lived in Los Angeles and his tank was in our kitchen, where he got a lot of indirect natural light. He usually basks for several hours a day.
This is his first winter in NYC, and our apartment is considerably darker (northern exposure). Though everything about his setup is exactly the same as it was before (UVA/UVB, Eheim filter with in-line heater set to 24° C, clean tank every 2 weeks), he's been spending several hours a day sleeping at the bottom of the tank.
He's basking a couple hours a day, swimming almost as energetically as ever when he's awake, he eats with vigor. His eyes are clear, he's not swimming crooked, and there's no evidence of any respiratory infection or shell rot or anything. When I take him out he loves stomping around the apartment.
He just sleeps at the bottom of the tank a LOT and is more mellow than he usually is.
Is he reacting to the lower ambient light even though he has 2 bright tank lights (basking and UVB)? Is he reacting to the ambient temp in the air, which is definitely colder than it was in LA? Is he simply bored because he's not getting as much company as we did in LA?
Please advise; I love my Scooby and this behavior is concerning me.
Yes, before anyone says it, I am looking for a turtle friendly vet in NYC and if anyone has a rec I'd be grateful.

