Seedsman White Widow in Living Soil

This week I was gone for a trip for the majority of the time, and it seems while I was away they have struggled a little. The photos are from before I left, and I watered with a compost tea. They enjoyed that but soon after I left they looked droopy and I noticed some of the bottom leaves on the canopy were yellowing. I am not sure if this a nitrogen deficiency. Slightly worried but they look mostly healthy otherwise. I realize that I must have not FIMed far down enough, as it seems it has continued to grow normally. I may try to FIM again, along with some LST next week.