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Help, need diagnosis on leaf appearance

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Can anyone please help me, I don't know if this is a fungi/disease or a nutrient deficiency. I have good ventilation, humidity is almost constant at 65% and temperature never go below 20 Celsius and never go higher than 29 Celsius.      I give them special cannabis feed (bio-grow) powder. PH is 6,7 (soil). I have four plants which two are effected and the other two is doing perfectly fine and they all get the same nutrients and have the same soil mixture.

Your help is appreciated.    








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What soil are you using? It looks like a pH issue. Nutrient lock out. If it is soil why are you feeding nutrient at this early stage?

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