Need help identifying these black spots on one of the plants. Looked for signs of mites, did see any. Can I spray some fungicide (diluted neem oil) as a preventative measure? Can I spray while the lights are on?

Or maybe it is something else entirely. Thanks for the help as always.
MRDiff Reviewed by MRDiff on . help with sprouts under mh w/ pics What is your experience level? Novice. Second timer, trying to get it right this time. My concern in the yellowing of the false leaves before they really have 4 real leaves. They started out fine, sprouting between the 13th and 16th but in the past 4 days, I have not seen too much growth. I have adjusted my lights from 3 feet to as close as 2 feet, but the 2 feet seemed to make things worse. Is it possible that 3 feet is still too close for 6 seedlings? Thanks in advance for any help Your Rating: 5