I am growing seeds from Home grown
Last year I grew lemon auto flower indoors and had great results
This year I ordered Purple Kush
I only have two plants growing at this time indoors under LED lights
One plant looks awesome. Dark green and no issues
The other one has brown spots on the leaves
The one with brown spots is taller than the other one
I am not sure I got the same variety based on how the two plants look?
Both have the same soil - Ocean forest, but reused from last years crop mixed with fresh Ocean Forest
Distilled water, so PH is flat
3 gallon fabric pots under LED lights
I am using 3 teaspoons of Fox farm Grow big in one gallon of water every other watering
I included a close up photo of the plant that has the brown spots
Can anyone take a guess as to what is wrong with this plant?