I beleive the calcium is the problem...because yes..i have scale on my faucets here, well water that has much iron and calcium. i will look at the link and put a pic of a plant from earlier in the summer, i had bout this plant as a clone and it flowered early as it went from a 24 hour growlight to regular outside light, this plants leaves if you look close are purpling, i just asumed it was normal as the tag on the plant was a purple dot. Now..my young plants are all with purple stems and pruple and yellow leaves....

the book i am using..medical marijuana bible by cervantes suggests that the deficiency is in mag. that is the only one that says anything about purple stems and leaves.

i have been using fox farms grow big, but i am thinking that the large amount of calcium in my water is preventing the uptake of the nutes.

My question is, how can i get the calcium nutralized or out of the water that i am using on these plants.

thank you so much for your input and i am adding pics below, also will be going to the link you provided. note the purple on the stems going to the leaves, also the leaves light purple color.
tcbud