Very slow growth

all feedings the same does not equate to all plants being the same. so, stop thinking like that. if there is a difference in an indoor grow it could be what you do, it could be genetic, but that isn't relevant. just react to the different behaviour sooner. almost certainly a toxicity, since others are healthy and you have fed consistently. Ease off for a while. hit the reset button and eliminate possiblities before dumping anything into soil. doing everything the same will not guarantee the same results in the plant. so many factors the eye doesn't account for. so many things you have no idea you did dfferently, but did. even if anal about precision, which few are. Especially in soil. While it is a buffer for mistakes, it also is less micromangeable in regards to know exactly what its contents are for nutrients. microbes have their say that you cannot account for with common sense and an eyeball.

Hi mate, first of all I checked from your diary that you use bloom nutrients. You shouldn't use bloom nutrients at this stage at all. Second, you don't use Cal Mag. Third whats the ph when you water and the runoff. Finally I would like to suggest to you that when you grow indoors under no circumstances your plants should get in the great outdoors. These plants haven't developed any natural resistances to pest and you ll probably get something and destroy the whole of the garden. When you grow indoors you grow indoors and that's the end of the story. So my opinion is (all those mentioned affect the roots) that if its not a ph related problem, you stopped using bloom nutrients, and added Cal Mag (which may not be necessary if the ph is corrected) you probably got a pest. I see you use advanced nutrients, I do as also. But what you use is just the base you must use and the other supplements to have the max results.