Pinus Tabuliformis seedlings

I just picked these up at a plant sale. Pinus Tabuliformis (Chinese red pine). I love pines they are small but they bring me up to 11 species in my collection. Dose anybody else have any experience with these? It is my understanding they are not a common species in horticulture outside of China.

Too bad you don’t have any good answers. I don’t have any of these but can suggest some fertilizing if soil is not wet already. Reason being yellow weak looking needles.
Seems I saw these SOMEWHERE on the Bonsai Nut website.