Necrotic spots on fan leaves?

To give some detail of my setup...
I have 2 autoflowers (Zkittlez and GelatOG) in a 2x4 tent. Both are week 5 veg, showing pistils.
My light is the Series 2+ Red spec 250w from BudgetLED and currently have it dimmed to about 80% maybe.
Temps steady at 75-80°F, Humidity a bit low usually high 40s, low 50s.
My medium is Royal Gold Tupur mix (coco based) in 3 gallon smart pots.

For the last week or so I’ve started using H3ad’s modified Lucas formula although instead of the 6ml/9ml and 1g Epsom per gallon I started them at lower EC to see how they would do with the switch.
So I’ve been using this:
0.5ml Stout MSA (mono-silicic acid)
1ml Calmag (2% N, 3.5% Ca, 1% Mg)
0.5g Epsom salt
3ml GH FloraMicro
4.5ml GH FloraBloom

which gives me around 0.7 ec and 500ppm and I pH to around 5.9-6.0 mostly.
I use ro water and water twice daily on a timer with my dripper system. I handwater once every 4-5 days as well to try to make sure everything gets saturated.

Yesterday, I also added photosynthesis plus to my res at 15ml/gal to try and prevent harmful bacteria in the res.

here’s some pictures of the damage..

Here’s the whole plant



Some drooping as well

there are a spot or two on my other (gelatog) but it looks healthier as far as drooping and leaf color..

Hand watered last night with 0.5ml Stout MSA, 1g Epsom salt, 6ml FloraMicro, 9ml FloraBloom. Diluted it to 0.95 ec, 660ppm and pH 5.80.
Gotten more spots over night. Unsure what’s going on..

Hope its not thrips

Your sure ph isnt fluctuating too much

bam0813 said:

Hope its not thrips

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bam0813 said:

Your sure ph isnt fluctuating too much

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I’ve checked all over, no sign of pests. Also been measuring runoff ph and it’s been steady at 5.8-5.9 each time.
Idk what’s going on, seems that for now only one of the two plants is having issues and they’re both watered from same source every time. I’m stumped.

Me too, somebody better than me will help you. This may be stupid but Is there any way its something genetic

Just off the head but you may be experiencing a deficiency due to perhaps overwatering .maybe by drowning your root flow ... .. try to let them dry out completely in between feeds. It’s hard to say ...looks like it need a trim for proper airflow too ... not sold on a nitrogen deficiency either but would rule it out

323cheezy said:

Just off the head but you may be experiencing a deficiency due to perhaps overwatering .maybe by drowning your root flow ... .. try to let them dry out completely in between feeds. It’s hard to say ...looks like it need a trim for proper airflow too ... not sold on a nitrogen deficiency either but would rule it out

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It’s coco. Letting it dry would be the worst thing I could do.

bam0813 said:

Me too, somebody better than me will help you. This may be stupid but Is there any way its something genetic

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Doubt it. I’ve run this strain all the way through before and didn’t have this issue. Same medium too.

Damn yah not good with coco... doesn’t look too bad tho just stay on it might bounce back ... good luck

323cheezy said:

Damn yah not good with coco... doesn’t look too bad tho just stay on it might bounce back ... good luck

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Thanks.