water leaves dying, please save me

about a 2 weeks into flowering one of my plants water leaves are dying at a fast rate any suggestions or help? thank you

What are water leaves are you using any nutes? could be a deficiency.

Flowering..buds are using nutes.

Give us details of grow method, Lighting, Temp, Nutes, PH. etc.

also throw in a picture of the complete plant.

If you really want us to help.

Ph and or heat stress.

Thats doesn't look like a heat problem but there is something out of balance no doubt.

im growing in a soil-less mixture called roots organic by Aurora, the temp stays about 70-78, im using a 3 part nute by GH, and i feed once a week and the rest of the time water with a dilute solution, i tested the PH of the medium it came out at 6.4, its under a 600 HPS with a oscillating fan. cant get a full picture until tomorrow as its night time in the tent atm. cant think of any other info to drop. thanks for the help

600<L<<<<<<< dude raise the lights it looks like you burnt your toast bro. its the art light has to be. could be the nutes but it could also be the lights. try raising lights and lighten up on the nutes by half( water less is all or delute)