Help. What deficiency is this?

[Hgrow4]

On some leaves on most plants they are brown marks I have attached photos.
My plants are week 4 of flower.
They are in coco the temp is 29 degrees and 55% humidity.
They are in coco and I am feeding shogun nutrients daily.
Any help would be much appreciated
Thanks

 

[Budzbuddha]

Prune it.

 

[Hgrow4]

Prune it.

I just pruned it last week quite a bit so was gonna leave it till next week.
Why should I prune it now?
Not saying your wrong just curious

 

[Racky]

What you using for water? My tap water does that with ph down. Cal Mag Always fixxes this issue for me.

 

[Rob Roy]

Any type of foliar spray ever happen ?

 

[Gemtree]

What’s your input vs runoff ec?

 

[Hgrow4]

What’s your input vs runoff ec?

5.8 ph 2EC
Haven't checked my run off in a few weeks.
I'm changing to RDWC after this run as I find coco to be a bit too much guess work for my in experienced self.

 

[Hgrow4]

Any type of foliar spray ever happen ?

Yes not recently though and this has come a while after

 

[Hgrow4]

What you using for water? My tap water does that with ph down. Cal Mag Always fixxes this issue for me.

Just normal Tap water down to 5.8 bro

 

[Racky]

If you use ph down, it may be a micro nutrient difiency. My tap water comes out at like 8.5 - 9.0. Usually about two or three weeks in, if I dont use cal mag. My plants start looking like yours. Now I just start cal mag at like two weeks.

 

[Modern Selections]

Raise the pH to 6.1 and you will see some improvement.

Also I would recommend doing an inspection for bugs.