Green soil residue, indoor planters
First post in the forums here. I'm starting to grow basil indoors under lights (T5s) for the first time (have grown basil indoors before, just never under lights or at this time of year). Anyways, I'm noticing a green residue on the surface in a couple of my planters. I used a standard potted plant mix, one Miracle Gro and one other brand. No fertilizer yet.
Is this residue (in the attached picture) something to be concerned about, and how to manage/eradicate?