deficiency cannabis or bacteria ???

[Aseed]

Hello , in first sorry for my english.
I would like an expert opinion on a problem I have: the small brown spot have appeared on the leave and I fear it is a bacterium ... I joined you photo.i grown in soil, , the temperature of the box is 26°c to 28°c day and 19 at night and relative humidity is 50 and day 70 the night. my tap water to a 0.1 ec and I add calcium and magnesium (2: 1) to have ec 0.3 and I water with fertilizer every second watering and my soil is of light plagron mix.voila hoping you could help me, thank you
and if you need more information do not hesitate

 

[Aseed]

 

[Aseed]

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[BOMBAYCAT]

What is the pH. of the runoff water? If I had to guess I would think it might be nute lock from too much or too little pH.

 

[Principante 8]

Being so close to the bottom of the pot it's possible some nutrient mix got splashed on the leaf and caused the burn spots. Without a whole plant shot you won't get a legitimate answer. A bad leaf on a plant usually means absolutely nothing. Several bad leaves and then your in a little trouble. Post the rest of the plant if you can.