Dead Leaves.... Please help, I have pictures

I dont know whats going on with these fan leaves. It's not the whole plant. I am using soil with 1000watt lights

If you need any other info please let me know. thanks.

do you have any pics of them on the plant? it might be easier to diagnose that way

do you know what your temperature and humidity are at? and let us know all you can? what nutes are you using aswell?

I dont have pictures of the whole plant with me but its not every leaf probably 10 leaves on 3 or 4 plants and there are around 15 plants. Temp stays around 82 when lights are on but CO2 is at 1500 ppm. temp goes down to 74-76 when lights are off, CO2 is off when lights are off. Humidity is around 40 at all times. I am currently using Fox Farm and i used Snow Storm and Cal mag in my last feeding.

any advice?

Has anyone had anything similar?