Nitrogen Toxicity? (Day 20, autoflower, Biobizz All Mix soil, only used CalMag and no other nutrients) My other plants look fine.

Das sieht aus wie wenn du zuviel und zu oft gießen tust. Hebe immer deine Pots an damit du ein gefühl bekommst wenn du wieder wässern musst. Lass die Wurzeln einmal Sauerstoff bekommen. Die Pflanzen erholen sich schnell sobald du wieder wasser gibst.

To me, this looks like the early state of phosphorus deficiency. I would wait it may be that it will grow together if the plant continues to grow, but should the areas start to turn brown or gray it is a p deficiency

Nitrogen does not look like it is at toxic levels yet. The droop you are seeing is slightly from overwatering. I get this from time to time it's really not too big of a deal. But take it as a sign to water a little less. I think you can bum your dli a bit low. If you are running 20 hours a day,and you DLI is 20 then your PPFD is only 300 which is a bit low. I have seedlings that pop and already like about 300 PPFD. You are in veg now so you can be almost double the light intensity. that will help the plant grow out of it quicker. it may not even that you over watered per say, or gave som obscene amount of water. if the light intensity is not high enough the plant won't metabolize the water or anything in the most efficient way. Guessing you are in week 2 by your journal. the plants look really big for two weeks,and for the most part healthy. i guess 20 hours of light a day had made them grow faster. i think you will have a easier time keeping up the health of the plant with doing 18 hours of light.

Looks more like overwatering ( guess plants stands in run off trays too ) and ph swing . Those spots could be sign of lack after heavy feeding or ph imbalance.