Hello! This is my first post, and I'm writing because I'm afraid I haven't been taking great care of my adult slider. I inherited him, and gradually made important purchases, so he now has a large tank, a basking lamp and spot, a varied diet, and a good filter. The one thing he's been missing (I'm ordering one now) is a thermostat. I think his water has been too cold, and I'm worried it has caused him an infection.
I'm including a photo of his plastron. All the other photos I've seen show a clear pattern of spots; our turtle has a smear of coloration that isn't patterned or distinct. Is this normal?

