Brown spots confused help?

Hi, so I have been growing for awhile and have never experienced this problem before. A couple of my girls seem to be having these brown spots on there leaves and it seems to start small and spread through the fan leave. I did a little research online and right now I am guessing that this is heat stress can anyone diagnose the picture and give me a clear answer of the cause please? Since I thought it was heat stress I toned down my lights to 600W to lower the temps, I also turned up the circulation fans. Also I just started flowering and on Day 2 and new growth seems fine to me.

Info on grow
Medium: Royal Gold Tupur Mix coco
PH Levels 5.7-6.1
PPM/TDS: x500 US scale currently at 600-700PPM
Current Nutrients
Sensi Bloom A+B
Cal- Mag 4ML/gal
Liquid Karma 5ML/gal
Humidity Levels staying right around 60%
Room Temps now at 77-81F before room was hiting 84-86F lowered lights from 1000W to 600W to keep the room more cool. Also turned up circulation fans, since I was thinking it was heat stress.
no CO2
Lights 1000W HPS toned down to 600W now

Your help is greatly appreciated thanks in advance

spiderT said:

Hi, so I have been growing for awhile and have never experienced this problem before. A couple of my girls seem to be having these brown spots on there leaves and it seems to start small and spread through the fan leave. I did a little research online and right now I am guessing that this is heat stress can anyone diagnose the picture and give me a clear answer of the cause please? Since I thought it was heat stress I toned down my lights to 600W to lower the temps, I also turned up the circulation fans. Also I just started flowering and on Day 2 and new growth seems fine to me.

Info on grow
Medium: Royal Gold Tupur Mix coco
PH Levels 5.7-6.1
PPM/TDS: x500 US scale currently at 600-700PPM
Current Nutrients
Sensi Bloom A+B
Cal- Mag 4ML/gal
Liquid Karma 5ML/gal
Room Temps now at 77-81F before room was hiting 84-86F lowered lights from 1000W to 600W to keep the room more cool. Also turned up circulation fans, since I was thinking it was heat stress.
no CO2
Lights 1000W HPS toned down to 600W now

Your help is greatly appreciated thanks in advance

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Have you always grown this phenotype, with that medium and nutes?

941mick said:

Have you always grown this phenotype, with that medium and nutes?

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I have grown this pheno before same nutrients, only difference was last run I used PRO MIX HP, but I also had a couple in the Royal Gold Tupur and I did not have this issue.

does your camg have iron in it?

941mick said:

does your camg have iron in it?

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Yes it does I use Botonicare Cal-Mag plus Iron,

Well it looks like CaMg+Iron deficiency and if your using RO water with coco you usually want to add a little more than recommended

Hey bro I think we have same problem don't mean to hijack

NyQuilkush318 said:

View attachment 3211850 Hey bro I think we have same problem don't mean to hijack

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lol its all good, but it seems a little different you have minor brown spots. With mines its big brown spots and it tends to spread on the infected fan leaves, until it completely browns out.

[QUO"spiderT, post: 10727425, member: 882580"]lol its all good, but it seems a little different you have minor brown spots. With mines its big brown spots and it tends to spread on the infected fan leaves, until it completely browns out.[/QUOTE]
Lol sorry bro look like we both need help lol