Help with Yellow Leaves & Brown Spots

[tekm8]

Hi fellow growers 

 

having a little problem with yellow leaves and brown spots on my baby, i'm growing in 8 x 8 x 4 room, drip feed, in clay balls, 2 x 50 litre pots, running to reservoir,

PH 5.8, PPM 700,

 

20.4 degrees water temp, room temp 25 degrees, humidity 53%

 

watering 15 mins on 30 mins off,

light 18 hours on 6 hours off, flushing every 10 days,

strain = pineapple chunks (barneys farm)

 

wondering if i have nute lockout, and would flushing fix this problem, also light was 300mm away from plant, i now have it 600mm away from plant, waiting too see if this has any effect on the plant.

 

any help would much appreciated, I have attached a pic for you to have a look at, also any reason there's only 3 fingers??

 

regards

 

tekm8