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autos ahhh.lol
yea theres ph stuff and all sorts of science to confuse you,while ph,water run off,heat etc all play such a huge role in your babies being healthy...
by the looks its a little small its only very young imo,I more than likely would have waited till I had about three sets of true leaves.however...
there are a few good charts on google images showing leaves with various deficiencies it may be a good place to start.your plants look healthy I...
if its bud shake which it sorta looks like,with plenty of leaf in it too.my suggestion would be too make gold oil.a small blob will go further...