Is this Magnesium Deficiency?

Lucky Luke said:

LOL..this is why i went back to growing outside in soil..lol

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I will be an outdoor grower in a few years. But for now I have to stay indoors.

I'm going to feed the other two with epsom salt in a few days/weeks and see if it helps.

Your recent pictures look a lot futher into flowering than the original pics and judging by the different plants id say your definatly not far wrong on some so whatever the problem it shouldnt be that hard maybe even just wanted a repot to some more space. I wouldnt add to much mag, what vostock said earlier makes a lot of sense and its not needed in much quantity compared to some others. Any fixes should show in a week or two on a younger plant not so far into flowering, if not that wasnt the cure.

Lucky Luke said:

Egg shells are a natural form of calcium as Dr Who mentions on your other thread. (u can even save em up over the "off" season.)

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Fantastic! Can't thank you enough for these super precious tips!