Back after post from two weeks ago, plenty of pics, Need advice.

Original post @ https://www.rollitup.org/t/need-help-with-plants-please.964774/

Ok its been at least 2-3 waterings with RO only. Looks to have got worse in the past few days. Purpling on stems and leaf veins has increased. Spotting in-between leaf margins and tips mid-plant has increased, with light spotting starting on some new growth. Old growth yellowing out, burnt leafs.
I have to believe its a Magnesium deficiency or potassium deficiency. I gave them half strength nutes at around 400ppm at 6.3 ph. 3ml of cal/mag, 4ml veg nutes, Natural ph up.

Thoughts? thinking I should go water, feed 1:1 or do you think in order to get back on track OR just keep feeding light doses and go straight water every 3rd feeding??

Nothing like growing herb to keep you on your toes and humble. Thanks all.

why not post ya issues in the correct forum may get the answers you FINALLY seek?

https://www.rollitup.org/f/marijuana-plant-problems.65/

I give you a hint ..as this is RO water adding, a little calmag each watering is a good move

and welcome

Thanks, new on here.. I normally use calmag at 5ml per gal i soil. See my last post, water to see if it was a lockout or a def. thx