what deficiency?

What the heck is this?

How far along are they in flower?

Magnesium?
Check this link and do some more online, lots of it out there. Thsi was closest thing I could find to your pic though. Do you run any CalMg? do u run RO water?
Link: https://www.icmag.com/ic/showthread.php?t=231387

Gets some CalMg on there asap. I use Calimajic by GH. It has some iron in it also. that is what I would do. Maybe with some better experience in this can chime in.

Is it only around the tops ? If so it could be a moderate light scorching.

Yeh that's not light burn man get some calmag or Epsom salts in there and check run off ph maybe up feed a little too?

Bose said:

How far along are they in flower?

Click to expand...

Just started my 5th week.

Ghettogrower187 said:

Yeh that's not light burn man get some calmag or Epsom salts in there and check run off ph maybe up feed a little too?

Click to expand...

I'm running dwc.

Cobnobuler said:

Is it only around the tops ? If so it could be a moderate light scorching.

Click to expand...

Yea just on a few tops. None of the lower and bigger leaves have it. Don't deficiencies start with the lower growth and work it's way up?

BakingcoOkiez said:

I'm running dwc.

Click to expand...

Im out then lol...simple minded coco grower here