What is this leaf spotting?

Thanks, both @organoman & @ChitownCannaChica . I appreciate it. My first thought is that it's not related to the lights since I've basically kept the same distance & strength since they sprouted. My Photone says that at plant top I'm in the range of ~1010-1100 PPFD, which I don't think is too aggressive. Makes sense that it is water related...I'd been using the GH Trio schedule as published by GrowWeedEasy as a template and was using the 2nd week formula, but too strong I'm guessing. Oddly only one out of my 4 suffered. Possible that this is also partially stress from having transplanted/topped/and fed all in the same week (albeit across 5 days)? Checking this morning shows that the discoloration hasn't spread or progressed, so I guess it's not too bad, given what some I've seen have looked like. Organoman, I happened to have the molasses in the pantry, so I figured 'why not'. ;) But thanks for the additional suggestions. I'll do some looking into it and try it out in a handful of weeks once my next grow happens.

To me it looks like burning from excessive fertilizers. Baby plants need baby feeding and if you are using decent soil, no extra feeding until roughly 4 weeks. After this, quarter or half strength nutrients is plenty strong enough until the plant is a foot or more taller, then half strength is all that is needed. Forget about using molasses, it doesn't really do anything for your plant, it may/could help your soil microbes VERY slightly, but in all honesty, it really does not do anything. If you want to give something that actually does something, give your plants humic acid, fulvic acid or amino acids, (or all three for a turbo boost!), these will all do 10,000 times more benefit for your plants than expensive sugar water (molasses). My latest "wonder" ingredient that has proven exceptional benefit over the last couple of years and with quantifiable results is using "Mykos" from Xtreme Gardening, or a similar mycorrhizae amendment. These are outstanding products and while a little pricey, they are worth every cent. After 35+ years of growing, this product has impressed me so much, that I would never consider growing without it ever. Most grow shops have these products, otherwise eBay. The main benefit is the way it makes nutrients super available to the plant, reducing fertilizer use, and increases the plants vigour and overall health remarkably. Hope this helps, Organoman.

Here’s the background… pretty aggressive week. Sunday seedlings were moved to the 5gal bags, Tuesday they got nutrients, molasses, etc. Wednesday they got topped, and today (Friday) they got watered (7.0pH) to a 6.5ph runoff. They’re under a 225w HLG and a a couple 32w side fills at about 16”