Unsolvable problem - 6 months dealing with leaf decay

[SamRD]

Guys I don't know what to do anymore. Nobody has been able to identify the problem. Some plants have it, some don't, all grown under the exact same conditions. I tried cal/mag and they immediately started curling tips and showing signs of nute burn so I stopped.

 

[BobThe420Builder]

Need all yer grow info

 

[SamRD]

Need all yer grow info

I'm 6 months in, beginning of flower.

Soil is MG moisture control. (I know it was a mistake). Only nutes I've been giving for a while are advanced nutrients bloom. They are growing outdoors in my balcony.

 

[Kushash]

Guys I don't know what to do anymore. Nobody has been able to identify the problem. Some plants have it, some don't, all grown under the exact same conditions. I tried cal/mag and they immediately started curling tips and showing signs of nute burn so I stopped.

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The last picture, the leaf blade at the bottom of the photo has white specks that might be a bug issue unrelated to the brown dead patches on the leaves. Find out what those white specks are from, might be spider mites.

 

[Failmore]

Wow. 6 months and not even flowering yet. That is a long time.

 

[SamRD]

I'm taking care of the mite problem but I know it's not from mites because another plant I had had the same issue and no mites. Someone recommended manganese, I bought this one but it came with no recommendation of dosage and now I can't use it. Does anyone know how should I dose it? I think I'm doomed lol

https://www.amazon.ca/gp/product/B004RXD1HK/ref=ppx_yo_dt_b_asin_image_o01_s00?ie=UTF8&psc=1