My first closet grow AK-47

So this is my first attempt at growing.

my setup:

3 feminized AK 47
2 54 watt t5's for veg, 2 150 watt hps for flowering
7 gal pots
using botanicare pure blend pro veg/flower and liquid karma.
growing in promix.

so im 6 weeks into my first closet grow and my plants are 16" 18" and 19" with about 16 nodes each and about 15 secondary budsites.
im waiting till my relatives visit and leave before i flower these bad boys and stink up my house.
ive been slowly transplanting from a solo cup, to a 6" container and now finally to its 7 gallon container.
for the most part my plants look healthy. at week 3 or 4 when i transplanted all my plants to the 6" container, i watered them right after the transplant until there was runoff. 2 of my plants responded well to this whilst the third might have been to small for this and stopped growing for about 5 or 6 days. since then it has been developing light green tips on its new growths. i think it might be partly due to the fact that my t5's are sometimes touching my plants, i do have a fan oscilating on them so burning them isnt really an issue.

my inexperienced self is guessing that its magnesium deficiency from reading things online but id like someone to correct me and tell me what is actually going on


here is a bunch of pictures of my setup and then pictures of my plant with problems.

How are those baby's smelling?

surprisingly not much at all. they smell like plants. im 3 or so days away from flowering them now, theyre growing like crazy, i think im gonna have 4' plants by the time im done