Please help brown spots on leaves

[Cannaburg]

This is what a cal mag deficiency looks like late in flower....

 

[denoss]

This is what a cal mag deficiency looks like late in flower....

Thanks for the info here is a update of my leafs.

I will be adding cal mag later today and checking ph and ppm run off light is on 24hr

 

[denoss]

I will be adding cal mag later today and checking ph and ppm run off light is on 24hr

Leaves have gotten worse guys I am really hoping the cal mag sorts the problem out will be checking ph and ppm run off today aswell. FYI the light is on 24 hr

 

[Bdubs]

I can see you have your other nutrients on point with that slight tip burn. I personally like to see that as long as it doesn’t progress down the leaf tip. It lets me know I am on point and she is at the limits of what she can handle. Excited to see how that calmag works out and squash this deficiency.

 

[Cannaburg]

I will be adding cal mag later today and checking ph and ppm run off light is on 24hr

Im.close to finishing so not bothering to rescue my girl...

 

[denoss]

Quick update

I done run off and the ph of runoff was 7.5 and ppm was 450 ec was 0.890 gave her 0.25ml of calmag 0.25ml of terra vega so I don't risk nute burn.

 

[Cannaburg]

Depending on brand I usually run between 2.5 to 4ml of calmag

 

[denoss]

Depending on brand I usually run between 2.5 to 4ml of calmag

Brand is biobizz is says between 0.5 and 0.8 but that's probably for a photo I have auto

 

[denoss]

Quick update

I done run off and the ph of runoff was 7.5 and ppm was 450 ec was 0.890 gave her 0.25ml of calmag 0.25ml of terra vega so I don't risk nute burn.

Black spots are appearing on the leafs below any idea what could be?