My view is that there hasn’t been much study on the species. So every piece of advice is a guess or based on having that species. My view (and I have never owned one) is that I would not assume anything about uvb and calcium with D3, unless you want to experiment with your turtles.Hi I currently have a juvenile Geoemyda spengleri do they require calcium supplement with D3 I can't seem to find much info on this seeing UVB is questionable with this species.