Plant dying please help.

Hi everyone

My plant is turning yellow with brown spots. I have no idea what it's trying to tell me. Can someone please help me before my plant dies thanks in advance

600w air cooled with 8 inch
4 inch inline fan as exhaust
Two drip systems with ph 5.8 and early veg dose with heavy 16
Oscillating fan
I have attached pics. The only two things that I have in mind is under feed or ph problem. Any help is appreciated!

pics didn't come through.

Bugeye said:

pics didn't come through.

Click to expand...

Here they are

Low on phosphorous imo. Probably need a touch of cal mag too.

is it on one plant only or all? does it spread from leaf to leaf and plant to plant or does it stay on certain leaves on certain plant? what is your RH?
it might be leaf desease or mold of some sort. if u can remove the contaminated leaves without overwhelming the plant, do it. and make sure your fan makes lots of wind.
GL

can you take a picture of the whole plant and tell me what ppm you are running, as well as any additives? It looks like a few deficiencies.