What is wrong with my babies? Photos attached

Hi. I have tried in my journal to diagnose this with no luck. My research suggests a cal-mag def. prior to transplanting I think there was a bit of root rot. I am growing in coco, each water/feed is at 5.8ph, ppm never more than 1200 but mostly around the 900 mark. My tap water runs at 400ppm itself so I just started using bottled water until I get an RO system. Nutrients are canna coco running about 20% below the manufacturer recommendation. I've just done a water of cal-mag nuted water only.

What else can I do? Is this a cal-mag problem?

Any help would be much appreciated!

It's a problem of too much nutes, not enough research. One of these is easily corrected.

Maybe still root rot too.

keep your ppm,s around 200 for transplants, that is where i try and keep mine.

Looks like it could be an issue with phosphorus.

http://growweedeasy.com/phosphorus-deficiency-cannabis

Thanks for the quick responses guys. It's my first coco grow. I've done hydro, aero and soil with awesome results and not a single issue. Coco has been the opposite for me.

I transplanted them at 4 weeks, never gave any nutes for the first 2 weeks. After that I nuted at 25% solution. The problems were there from the time I added nutes. I've been using some AN nutes for roots too. If I transplanted from 500ml pots straight to 3 gallon pots, how much would I need to water to flush? I don't know how it's gone wrong, my ph is never more than 0.02 off of 5.8 so surely the phos should be getting absorbed. Runoff I measured at 6.5 the last time I checked. The research I did said it's pretty stable in coco. The other contradicting info is how often to feed. I was going everyday even if it was still a bit moist. The canna bottle says 1-3 times a day, some say as I would with soil, others say as you would with hydro.

I will do a flush today as I never fed yesterday. I don't know how I could keep it down to 200ppm though? That's almost no nutes

Seems the problem has been solved. I've had a nice growth spurt and nice green leaves. Foliar sprayed a bit and flushed with a 75% solution mix at 5.81ph and 1400ppm total. That includes a 100% dose of magne-cal.

Coco learning curves, hydro and soil are much less of a headache but I have a feeling this is gona be a love hate relationship that will still last longer than the others