Help identifying deficiency

I'm guessing calcium or magnesium.

It is definitely NOT nutrient burn, I'm using General Hydroponics nutrients at just half strength, and plain water after every few days. Plus these are young plants still in veg.

coco?

Yes coco & perlite 50/50

RO?

you need calmag

Tap water. But I'm religious about PH, keeping it around 6.0.

Maybe I've been toooooo light on the nutrients, was doing 1/4 strength for a while and 1/2 strength for the past week but it's getting worse. I'll give them some calmag for now

kovidkough said:

you need calmag

Click to expand...

If he's not using "Cocotek A+B" yes. There's a lot of Coco specific nutrient lines.

Couple more pics just to be sure. Lots of brown spots, stems are really purple.

Potassium and Phosphorous deficiency. Stop starving your plants.

Ok I will. Awesome thanks guys