Deficiency Help please - Coco/LED - near harvest

[Litmus]

Hi Everyone and thank you in advance!

I'm at day 40 of flower and running into some deficiencies I'm having trouble figuring out. This is my first grow. Here's the details.

EC 1.4
PH 5.8-5.9
Res Temp 68
Room Temp - 70 night - 77/78 day
RH 40-48%

Nutes (25 gallon Res) - Less than recommended feeding by Canna
Canna A&B - 140ml
Calimagic (1-0-0) - 30ml
Rhizo - 10ml
Cannazyme - 90ml
Canna Boost - 60ml
PK 13/14 - 40ml
Earth Juice Microblast - 25 ml

The micro gets added every other week. Lower leaves look like N toxicity. Some red stems. upper leaves curl upward. I've raised my lights from 8" to approx 13" thinking light burn may have been the prob.

Any help would be greatly appreciated. Here are the pics.

 

[Litmus]

Couple more pics...

 

[LarryBudMelman]

Can't see the pics bro

 

[Litmus]

They all show up on my end...hmm

 

[Litmus]

I just switched my photo album to public. Not sure if that was the problem with the pics. Hopefully someone can see them

 

[Kweku Ananse]

I had problems using calimagic with canna. Cal mag plus works better. No Cal carbonate, yes Cal nitrate

Check your runoff, I bet you got salt build up (high ppm). I'd recommend watering with more runoff each watering. (mini flushes)

 

[Litmus]

I had problems using calimagic with canna. Cal mag plus works better. No Cal carbonate, yes Cal nitrate

Check your runoff, I bet you got salt build up (high ppm). I'd recommend watering with more runoff each watering. (mini flushes)

I usually water to at least 15% runoff, once daily, in 5 gallon fabric pots. I'll pick up some cal mag plus tomorrow. I flushed with PH 6 straight water today. I read this afterwards so I will check my runoff tomorrow.

Thanks Kweku for the advice!

 

[Kweku Ananse]

If you flush anytime besides final week(s), never with straight water, always leave nutes in da coco. Like flush w 1/4 dilution of your normal regiment until your runoff e.c. Is @ ~1.4 (what you aim put in), then put one last bit of normal strength thru. Boom no more buildup. bigger yeilds too.

Hmmmm... I'd say go for more runoff... 30% at least. More if you don't think it's wasteful. Your runoff EC should be revealing of whether or not you're running off enough

 

[Litmus]

So I changed my res today to do a fresh run with the cal mag plus you recommended. Runoff til EC matched 1.4 in and out. Yesterday's flush seemed to help too. They were looking a bit better when I poked my head in after lights on.