From a fellow grower: All seeds germinated, they did not grow. They are 6 weeks old and still alive, but only about 4 inches tall. They have not gotten any taller since about 6 days after germination. These are white widow autoflower. They are 18 inches from a 400 watt LED
And boom, there is the problem right there. The light won’t produce good results.
It should be fine for veg, I can get a plant over 4 inches tall with one of my 80w blurples in a lot less time. I dont think that is the issue here. I think that we need more information, like what medium, how much water, how often they water etc.