first grow problems?

My first grow and I am running into a little bit of a problem. I was wondering if someone could let me know where I am going wrong. She's Northern Lights and almost 2 months old in a 5 gallon nursery pot with FFOF mixed with some perlite. I have been letting her dry out between waterings and 2 weeks ago I started to feed her from a general organics go box with the recommended light feeding. The box says ph'ing isn't needed, but for shits and giggles I checked the water before feeding and it's in the mid 6's. Water without nutrients is in the mid 7's. She's growing indoors in a 4x2x7 tent with 2 led panels. The temps are in the mid 70's during the day and mid 60's at night. She was on 18/6 but 2 days ago I flipped her to 12/12. I have noticed discoloration on a few leaves mostly lower ones that aren't seeing much light, and some of the top ones seem to be very glossy looking. Any info and or advice would be appreciated.

I have to say im not quick to try and call this one

if you want to take the time to give me the nutrient info I can run the numbers and see if what your mixing is in range and that might give us some answers

but I will need some info

I need a picture posted of the guaranteed analysis info from each bottle and how much of each in mls you add per gallon

it should be on each bottle and it mike look like this
example;

N..........5%
P...........11%
K...........26%
Ca.........3%
Mg..........1%
Fe............0.1%

that's cal mag 5ml\gal you'll be ok...but she's looking sad you need a stronger light and don't let her dry out so much....ALSO sorry..you need to lst those branches out so you'll get more space..those fan leaves are blocking a lot of plant...now don't go and cut them. just get a drill and some para cord. drill the pot lip and tie the branches down

like so

You don't by chance spray your plants regularly do you? Looks like water damage and it doesn't seem to follow the regular deficiency patterns. Overall the plant looks great.