Cal-mag deficiency possible

[mountain green]

I have a few chocolopes and a LA confidentail that have recently gotten brownish or copper rusty color spots on the mid set fan leaves, the leaves have also curled down the length of the leave. Its also drinking very slow. Could this be from a weak batch of cal-mag.

 

[heater]

Scroll down to calcium lists the causes and fixes shows pictures of damage.
It helps to list your grow medium etc.

 

[ReelBusy1]

What nutes r u using?

If you are in the 3-5th week of flowering the cal-mag issue can happen.

One of the best ways to avoid it is to supplement before and during early flowering.