Brown spots on leaves please help

[Millo]

Hello, noticed since yesterday those brown spots. Plant is 6 weeks old, white widow auto from rqs.
Light spiderfarmer sf1000 @ 22" and 90% intensity.
Soil BioBizz All-Mix.
Nutes:
Alg-a-mic 1ml/L
BioBloom 1ml/L
TopMax 1ml/L
CalMag 0.4/L
22°C - 50RH
I also have a royal dwarf in there which doesn't show those spots so it shouldn't be the light...
Any help is apreciated

 

[Justlove growing]

Ph problem maybe have u checked your runoff ppm and ph?also your leaves seem to be clawing down a little so maybe ntox

 

[CBDbear]

as justlove said seems like u do not ph your fertilization h2o mix so the plausible lockout, try spray them a couple of time 0.2 ec cal mag ph 6.4 to give a patch for the next week than correct the ph of medium, it happened something similar to me becouse my ph tester was broke!
but still a claw from N toxicity when he is providing none extra to the soil are autos that sensible?

 

[Millo]

The claw is prior to this, it was N tox but I stopped giving veg nutes since, only flower nutes so not so much N anymore. I never water till runoff, since I'm using organic nutrients. However I might try it on this one. I don't measure ph of soil, nor have I got the ph meter. I read that measuring ph of soil runoff is innacurate and also that the soil should buffer it so I never bought one.

 

[Justlove growing]

The claw is prior to this, it was N tox but I stopped giving veg nutes since, only flower nutes so not so much N anymore. I never water till runoff, since I'm using organic nutrients. However I might try it on this one. I don't measure ph of soil, nor have I got the ph meter. I read that measuring ph of soil runoff is innacurate and also that the soil should buffer it so I never bought one.

Sorry mate I didn’t read your thread properly u shouldn’t water to runoff with organic as u will wash away all the good microbes imo but I’ve never really grown organic only outdoor but I’m sure u will find some great soil growers on here to help u out good luck mate u should still check your ph in water though I’m pretty sure something around 6.5

 

[CBDbear]

I'm shure someone else can give u better pointers... but I belive you might feeding a pretty high alcaline solution to your girls, that might help to lockout the N and the calcium the Fe too!