So, I have almost managed to kill seedling 2 as well. The first one is not quite dead yet, but it's very near now.... I'm still struggling to find the correct hang height and dimmer setting on the light. I also realised the main problem was that my seedling box, that I thought I was cleverly using, kind of cooked the seedlings. The box itself had melted from the heat, so it must have got pretty hot. Anyway, the seedling is now 18 days and it's tiny. I'm hoping I haven't done too much damage, and that it will recover. The other seedling in the tent is doing worse, but I have hope for both. Even the first Wedding Cake seedling I cooked is looking like it could recover.