Need help with diagnosing - Magnesium deficiency?

[cufix]

Hello guys,

currently I'm running:

3x Damnesia from GH-SH
&
10x Super Skunk from Sensi

Damnesia is 3 weeks old and Super skunk is 2 weeks old.

- 10 of them are in 11L pots and 3 in 9L aeropots,
- using 60%coco 40%perlitte mixture,
- feeding with Advanced nutrients, pH perfect 3part Grow-Micro-Bloom,
- feeding daily with around 20L of water + nutes - currently at 3ml/L (around 1,5L for each plant) with drip irrigation system,
- using LEDs, 1 MARS 900w and 1 unknown LED 120w
- Temps: 22/27°C
- RH: ~52%
- doing something between SoG and SCROG.. using net to support my flowers, but I won't train them much. They're going into flowering around next week.

The problem is with 2 plants. Booth Damnesia. Their leaves are getting weird, but not at the bottom nor at top, and I'm unable to determine disease they are dealing with. And the third Damnesia is completly fine and so are all Super Skunks, which is weird.. Same feeding regime, same light, same nutrients mixture, everything is the same...

I will also upload a picture of my ladies together and am I the only one who thinks that Super Skunk is growing a bit slow? It's only 1 week younger than Damnesia and yet so smaller.

Thank you!

And here is the picture showing how small super skunks are. Damnesia is 3 weks old and Super Skunk is 2 weeks old (from sprouting):

 

[BuddroGreen]

How far away do you have the Mars LED?

What is the pH of your nutrient solution before feeding?

Do you use RO water?

I use AN GMB(grow,micro.bloom) myself for DWC, for Coco I use AN Sensi Coco Grow A/B & Coco Bloom A/B, it seems to be formulated & works best for coco, there are some special needs with coco since it likes to bind up Calcium & Magnesium, and helps to deal with the abundance of Potassium already in the coco coir itself.

 

[cufix]

Around 35cm-45cm.

Not sure since I'm using liquid pH tester.. But I can tell it's around 5,5-6

No, I'm using tap water or even water directly from pipe.. Didn't have any problems with that in my previous grows.

Yeah I'm switching to Coco grow A/B & Coco bloom A/B, when I'll be buying new supply.

Anyway, it's weird that only 2 plants are showing signs of a disease, the rest are pretty fine. And they all have exact same conditions.

 

[cufix]

How far away do you have the Mars LED?

What is the pH of your nutrient solution before feeding?

Do you use RO water?

I use AN GMB(grow,micro.bloom) myself for DWC, for Coco I use AN Sensi Coco Grow A/B & Coco Bloom A/B, it seems to be formulated & works best for coco, there are some special needs with coco since it likes to bind up Calcium & Magnesium, and helps to deal with the abundance of Potassium already in the coco coir itself.

Hey hey?

 

[BuddroGreen]

I would flush them, and give them 1/4 - 1/3 strength nutrient solution.

 

[cufix]

I found out that it might be pH problem.. Because I was measuring it worng way (it was a bit higher than I thought, around 7 instead of 5,5-6), so it was Mag lock out I guess.. Since then, I have none problems and plants look really healthy.

 

[BuddroGreen]

Good news! pH perfect is suppose to keep you in the correct range, but I have seen it get out of range when the plants feed heavily & and when using carbs for plants, and bennie's will do it as well. Also, if you take your pH reading in the dark time the pH will usually go up (more alkaline) and if you take it during lights on, it will usually be lower (more acidic).

 

[flexy123]

Does not look like MG def to me. Nute burn maybe?