Gorilla Glue - First Ever Grow!

🌴WEEK 6 DAY 1 VEG🌴 As you can see after defolitating some leaves to expose lower shoots to light worked out perfectly as she back with a full canopy and most lower shoots have had chance to reach the same hieght as others along with some lst & tucking with her rapidly growing new shoots and leaves tells me shes happy but i am seing a few of symptoms allong the way which i have posted (images) below I find these odd rust looking brown marks on my plant i also had found 1 leaf that looked asif it had been eaten at with this browning close by, i belive it is not pest as i have tried to inspect as best as i can and i do not see anything but i havent checked with microscope :( but im sure its not pest related another thing along my journey that hasnt been exactly how i expected is run off, im week 6 day 1 shes growing fast and seems happy im giving 3L of water at 608ppms with a ph of 5.5 allowing the coco to slightly dry before watering again when i check my run off ppms its way lower today i gave 608ppms it came out at 180ppms WTF :( if anyone read this far if you know your stuff could you possibly help me out take a look at my photos/videos and let me know what you think of my plant.. is she looking healthy.? do you know what these small problems could be? thankyou, Lets Grow!