Leafs

Most likely nothing... The pale spots... if they expand like a crossword puzzle, it could be leaf miners - bug. those types of formations can occur, the spottiness can be normal too. So, scope underneath leaf of the spotty ones. Make sure you don't see any tiny bugs. early leaves are often imperfect. Make sure that stuff isn't expanding/spreading like a disease or pest, and if not, not likely anything to worry about. The last picture look like something, obvsiously.. first i'd ask if you let the top layer dry before irrigating again? if not, this could be overwattering. kinda curious how that started.. seems localized and not spreading, so i'm guessing overwatering? AN is typically a little too hot. I'd dilute 5-10% of what you are doing now (*if you haven't before). this is a hydro nute, so make sure you get 10% runoff or more each irrigation. Allow top 1" to dry before fertilizing again.. .you fertilize with "hydro nutes" in soilless substrate each and every time with runoff, it'll maintain equilibrium in substrate. Standard soilless grow method. side note about the one not growing tall -- are the nodes super tight? if so, may need a little less light.. position it into a weaker area, like a corner. If it's normal, probably just a differently structured plant -- indica vs sativa. indica will be bushy, shorter. they'll branch a lot more and make up for loss of height. yields are similar. makes evening out canopy a little difficult. Could raise it up with some books are other object as needed, if canopy gets too uneven.