Burn or deficiency problem - Help please

SandyRatchet

New Member
Hi all
Sweet tooth auto. About 7 weeks now. 35inch high and very bushy.
Hydro DWC.
Ph no problems 5.6 - 5.9
Ppm 300 - 400
1.2m x 1.2m x 2m tent
600w HPS and 2 x 300w LED
Nutes - vitalink hydro max bloom at 1ml/ltr which is half dose
Sensizym 0.3ml / ltr

About 10 top leaves on each plant have gone funny as per this pic
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It started on 1 plant and I thought it was light/heat burn as I had the HPS too near for one night while I was adding the LED lamps.
Now the other 3 plants are having the same on a few upper leaves.
I can't decide if it's autos being fussy about nutes being to strong. Even though I'm already using half strength. Or if they want more nutes. Or even if it's heat from the lights.
HPS is 19 - 22 inches above. And LED's are about the same. Not close enough to burn I would think but it sure looks like burn.
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