Judging by this and your other post, I'm guessing your light is way too close. 1000w HPS can be well over 2 feet away from the canopy.

You should probably do something about that ph too... 7.5-8.0 is basic enough to slow the absorption of many of the nutes it needs. 6.3-6.8 is where you wanna be.

If those two things aren't the issue, I'm afraid someone else will have to help.

good luck :thumbsup: