Help me Id this plant Problem (pic)

[VkingBud]

Hey Good People I ran into a problem this week that i have not yet come across and would like your help identifying this problem , looks like it is still in the early stages , so il do a good flush first thing tommorow growing in coco/perlite and im in week 2 of flowering , im growing couple of diferent strains and i am seeing the problem on 4 of the 5 strains , they are all running in Autopots , plants look healthy and growing fast except for this problem , only seeing the problem on some of the fan leaves have a look if someone can help me Id the issue , and some advise would also be appreciated thanks!

 

[Bigworm4201982]

More pics please

 

[VkingBud]

Only have this one for now but its the same thing on all the plants that are effected , il get some more pics tomorrow , what is weird to me and ive had my fair share of plant problems but its the first time ive seen the problem starts at the petiole and move outwards , any ideas?

 

[hotrodharley]

Only have this one for now but its the same thing on all the plants that are effected , il get some more pics tomorrow , what is weird to me and ive had my fair share of plant problems but its the first time ive seen the problem starts at the petiole and move outwards , any ideas?

Are you using LED lights?

 

[VkingBud]

Are you using LED lights?

Hey hotrodharley nope no leds , 600hps aircooled Hood , AC , plenty of ventilation , and circulation , not my first run temps are stable Humidity is fine , if just not yet seen this?

I’ve added a few new things to my nute line up for this run tricoderma and mycoroot at transplant 5 weeks ago , and I've added a silicon additive for the past 3weeks ending this week , im at about 750ppm keeping a stable Ph of 6.4 currently in week 2 of flowering

 

[myke]

let the ph swing so 5.8 on the first next water a little higher and so on ending at 6.2 ~6.5 then back to 5.5~5.8 repeat.
plant looks good.

 

[VkingBud]

let the ph swing so 5.8 on the first next water a little higher and so on ending at 6.2 ~6.5 then back to 5.5~5.8 repeat.
plant looks good.

Thanks myke apreciate it , did a flush , and fulled res with new mix , my ph climbs slowly so set it to 5.8 and il let it go to about 6.4 and reset! The Leave issue is still present but not speading so im not that worried about it , plants looks healthy
Have a gread day