I just read the "Marijuana Plants Problems and Cures" and i def think the i overwatered the plant and thats why those bottom leaves are turning yellowish
lmao...nah man, the yellowing isnt from overwatering, ur plant would be doing far worse than that if u over watered it, how often do u water it? make sure u only water when the top inch of the soil is dry, stick ur finger in the soil til about the second knuckle, if its dry, water, but it looks more like lack of nitrogen.
i think u should flush it i think it looks like maybe salt build up dats why nitrogen isnt gettin to the plant but ima first time grower so i might be wrong i just read alot n see alot so im just sayin im no expert i might be wrong
you proberly want to give it something wiv a bit less strength then that thats proberly wat the problem is specially at that stage give something like low npk just to start off then as they get bigger go stronger
at that age i would not even give it a full dose of nutes since it is so young. i would start out at half strength or even a quarter strength. then build up in quantity with each watering. i actually have the same problem with some of my younger plants, (the yellowing). am gonna look more into it. i'll let you know what i find.
those are grow bulbs and you do want them close to the plant. that is fine. compact flouescent lights can be used for growing blazek
from what i have read it looks like the starting of a nitrogen defeciency. that is what i am going to treat my plants for (mine are similar to yours). there is a good explanation of this in the top sticky of the plant problems section. good luck man