Help with inter-vein yellowing - Coco Hempy

[Q9550]

Hi All.

So I'm having a bit of issues with my grow I was wondering if anyone can help out.
Brief overview of grow:
PC case
Coco perlite hempy 1L
Northen Lights bag seed.
75 Days from seed
Approx 30 days into flower.
60W Led 4000k
Nutes is Nutriplex 3 part. Same npk as GH Flora.
Feeding twice a day till 30% run off @ 800ppm and 5.5 to 6.5 ph.
I was previously using 5-5-5 but have switched to 0-6-9.

I'm getting inter vein yellowing. I thought it might be a ph issue at first so I flushed the pot with PHd water at 6.0 and flushed till ppms dropped till about 800ppm and ph came out at 6.5
No sure if this is the correct way to flush but panicked when I saw the ppm run off was 1300ppm at first.

I'm still getting the issue. I water with tap water that has an ec of around 115ppm.

Here are some pics to help.

 

[cnile]

Help with inter vein yellowing. Coco Hempy

It all happened when u switch to 0 nitro nute?

Run off ph for my coco with gen hydro nutes is on point at 6.4 when it come out. That look like deff pictures to me.


So I've heard: in flower a run off ppm of around 1000 is not too bad, in midst of flower.


Is the water you water with always phed before you water plants?

 

[Q9550]

Nope it was happening before that aswell. Then I switched to 6/9
I ph to 6.0 after I add the nutes and then feed. I notice the ph of mixed nutes drifts upwards each day by a point I don't adjust unless it goes over 6.5

 

[Shaggn]

I just started getting rust spots on my leaves and now pH to 5.5. It drifts up as they consume the nutrients. The damage has stopped and bloom has resumed in full force. Try a light 1/2 strength feed at a lower pH 5.6/5.7. Coco is considered hydro which is a lower pH of 5.8. Peace!!