Trying to identify whats going on with my leaves

[Chappedj]

Good morning.

I'm trying to figure out what is going on with my leaves.
I have an occasional leaf on the bottom that dies. Pretty rare though. Occasionally, a leaf will start to look like this.

She is a Girl Scout Cookies from seed. About 2 months old.
Nutrients are General hydroponics at about 1100ppm, Ph is 5.8, under a 600w MH, Humidity is from 50-60%, ro/di water, Room is a steady 75 degrees.

Any ideas?

Thanks

 

[cannilingus]

lots of lower leaves die out. especially during bloom. that looks like a bit of burn. i have a problem, with some streins. that is, the upper leaves cup, and curl under. looks rad. lol. i have had several hermie issues with tga seeds.