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Hello Dolly, berrypilot is right this is a Ph/nute problem.
I Googled your "kangen water" and from a short read it seems cool that it ionizes/charges your water/particles it sounds like you have control over your waters Ph 2.5 to 9 with the push of a button( you still need to check it coming out of the pot!) But I don't think it adds calcium. If your run off PH is Around 6ish and has been for TWO months your soil is depleting of nutrients that it is going to need, that is were all off your nutrients are coming from and the longer in the soil the more the plant uses up. you are going to need to replenish the nutrients one way or another, seaweed is for stress not for just growing with,
http://www.growweedeasy.com/cannabis-health-tonic-recover-faster
I see the small plant next to your bigget one, in a small pot, it is have a problem too. That looks like a nitrogen deficiency!
What kind of soil are you growing in?
you will need a good one like fox farm or kind soil (I haven't grow in soil in twenty years, I made supersoil.)
For this grow pictured Im thinking you will benefit from
1) checking your run off PH.
once and only once your have that knowledge if needed
2) do some sort of fertilizer and adding cal-mag
3) transplant to a bigger pot with good soil especially that little one.
you can grow a small plant in a small pot, I just got done with a small 4" pot grow. Using fox fram trio and cal-mag ever other watering 12/12 from two weeks out. Harvest all of 5 grams pictures below.
Pls read this
http://www.growweedeasy.com/nutrients
good luck.