Does anyone have any idea what the little light green spots could be?
Two plants, one larger, one smaller, and the smaller one with these light green spots.
Same amount of nutrients and water.
Hmmmm... it's awfully lime green, isn't it. I wouldn't worry about the spots - some plants just have some weird coloring at the very beginning so no worries... And, since they're autos, it's FAR too early to be putting her on nutes (the color suggests they need some nitrogen BUT they don't like nutes until they're about 2-3 weeks old)... I'd just let them do their thing and see how they develop - The only thing I would ask is if you're making certain the PH of the water you give them is between 6.2 and 6.5... other than that, sit back and enjoy the beginning of your grow!
Good luck!
Hard to say, Its a long shot but it kind of looks like "tobacco mosaic virus". But the leaves are not twisted and look completely normal in shape. So I am going to say it is possible but highly unlikely.
I would go with PH is out of range as it can cause that. Never seen it do it so consistently though. Usually it will be a Bloch or two.
Genetics can also be the cause.