HELP!!!! Newbie in distress!!!!!

got sum xj13 clones in 3 gal pots. been using sensi grow, b-52, & voodoo juice with ro water. thought that i had over fertalized so flushed it but a friend said that my problem could be a cal-mag def. since I'm using ro water. Took a few photos of problem leaves. What do you guys think is my problem? Help a newbie out

Calcium and probably potassium is my guess. I would choose Botanicare-s cal-mag. cn

Here is another problem leaf

I ran into a similar problem when using R.O water.

I ended up going back to tap water bubbled heavy for 24hrs and use Advanced Nutrients Sensi Grow A&B every watering at 8ml per Gal. I water usually 2-3 times a week and if they need more I'll hit them with SeaGreen/H20 at .5ml per gal and Ph'd to 6.0-6.1 and things look perfect. For the roots I add "Root Bloom" powder at a 1/8-1/4 tsp per gal depending on size of plant for one watering each week.

Hope that makes sense. I'm kinda

What soil are you running and at what Ph? How often are you ferting and at what strength?

It looks kinda like a P def.View attachment 2478039
Here's a pic of mine last year when I got P lockout from the cold.View attachment 2478044