Hello people.It's been about 10 days I have this problem and it seems it's getting worst gradually.I'm growing 4 different strains:Masterkush, Super Silver Haze, Ice Cream and Blue Cheese.


Here are some pictures:
Attachment 279005
Attachment 279006

And the most affected plant, masterkush:
Attachment 279007

I've switched to 12/12 5 days ago.I'm using a 400 watt HPS and it's 45cm away from tops.Not overwatering or underwatering, temps 27-29 C lights on and 20-21 C lights off.I've fed them twice with biogrow, 1/3-1/2 of minimum suggested dosage and ten days later I added biobloom, 1/2 of minimum suggested dosage.It's been a week since the last.I'm using tap water which I let it sit for 4-5 days prior to watering.I suspect that it's the water though because it's very hard.

I've been searching pretty hard and the symptoms look like potassium or phosphorus deficiency or light burn.Light burn seems unlikely because of the light distance.I can't check the ph but since I've fed them very lightly I don't think it's off.So what's your opinions?
stefanosstef Reviewed by stefanosstef on . Yellow crispy fan leaves on 4 different strains.Deficiency or hard water? Hello people.It's been about 10 days I have this problem and it seems it's getting worst gradually.I'm growing 4 different strains:Masterkush, Super Silver Haze, Ice Cream and Blue Cheese. Here are some pictures: 279005 279006 And the most affected plant, masterkush: 279007 Rating: 5