I have a P. rosulatum seedling I grew from seed 4 months ago, it was doing fairly well until about 2 weeks ago when all of its leaves began to turn brown/ purple. I keep my seedlings on a heat mat, with a full-spectrum grow-light on for 12ish hours a day, watered with rainwater and there are no surface pests (am too afraid to stress it out by digging to look at the roots). The ambient temp has gone down a few degrees what with it being winter, but still, the seedling is in a fairly warm environment and I had some P. cactipes that were doing well until about 4 months, and then dropped their leaves and died too. Was wondering if anyone had this happen to their seedlings, or what the cause of the issue may be. A little afraid it's dying or going dormant at such a young age :\