Ok so here's the scoop - the vet at Seneca Animal Hospital - was the sweetest ever. He was excited to see Sheldon and was very caring and ran some tests. His diagnosis - winter stinks and I need to keep an eye on the water temperature. Sheldon is clear of parasites and in his words - "She's as healthy as a horse".
That's right - two vets have voted - and they concur - Sheldon is in fact, a Shelda. While It'll be hard to start calling he a her - I'm just glad that the doctor is as awesome as my regular doctor and since Sheldon seemed very mobile and happy and nothing looked off, that only if the legarthy persisted after adjusting the temps that I should call again and he'd actually x-ray and do blood tests. It's so nice to have found another vet that is willing to not just run up the tests that aren't necessarily necessary.
I've ordered a new heater and I hope it comes shortly. The old one is apparently just that - old. Hopefully things warm up soon.

Thanks for all the warm thoughts. I know Sheldon appreciated them too.
