Is it a calcium deficiency?

So I’m heading into week 12 with this zkittlez auto. 5 gallon fabric pot with FFOF under a 300 watt blurple. PHd water around 6.5, and doing FF trio at about 1/4 strength. Gave a gallon of water a few days ago with 5 ml cal-mag, though I haven’t noticed much difference, if any. Does this look like a calcium and/or magnesium issue?

FFOF is very hot. Looks like overferting. Most common problem for newcomers. I bet you don't need to feed anything for about a month when transplanting in FFOF.

A good measure in the beginning is to only feed when the plants are getting a lighter shade of green. Overferting will ruin potency and quality.

I’m at week 12.

kaiser soze said:

I’m at week 12.

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As stated before, this is most certainly caused by overferting.1.5 EC is very high for containers. I feed 0.65 EC with feed-->feed-->water intervals. Hope that help, cheers!

To proper flush the medium you need to water with at least 3x the volume of the container. Runoff EC will give you the final verdict of how you're feeding and what's in the medium. EC reading from the soil is better but most growers don't have access to that equipment.