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looks like nute burn to me. what kind of nutrients are you using in your foliar spray? nutrient solutions can burn your leaves.

temps would be a big issue with 1000w.

ventilation? 9 plants in a 3 foot by 3 foot by...6 foot tall tent? how big do you want them to be?

2800/lb. BC

sounds like you've really researched this.

are you allowing your water to sit for 24 hours before using it? what are your PH levels?

That is a pretty big temperature swing....whats your watering schedule like? are you allowing the soil to dry between waterings? if so how dry? they look pretty thirsty to me

maybe what i see is simly residue from your foliar spray?

I dont want to scare you but have you thought about bugs? some of the spots on your leaves in the 4th picture look like a shiny silver almost which is indicative of thrips. (thrips peel back a layer of the leaf to suck the juices out) leaving silver spots which can eventually start to die off...

look pretty dried out to me. what are your temps like?

Used doctor doom and sprayed for thrips, seems to have taken care of the little bastards. more pics

Try skipping using your nutes for one watering and just use your PH water

oh ok! thanks again

Thanks for the input! I've got some pest strips in there and am also spraying once a week so I'm hoping to be rid of the thrips soon! Not to worry about the leaf curl then?

I found this sticky very helpful for dealing with bugs (along with help from other forum users), hope it helps out your problem! hope mine isn't too serious!

Thanks a lot for your help guys!

These plants are mostly healthy (I am in the middle of treating for Thrips). They are just finishing up week one of flower and i notice the tips of some of the leaves are drooping and curling under. My soil is moist (but i let it dry between waterings) humidity 20-30 heat anywhere from 25c-30c...

had trouble finding a spray with spinosad in it....checked my hydroponics store and home depot, any suggestions on where to find it? I picked up some doctor doom and will spray with that just before lights out tonight

The intake is on the bottom of the room, didnt use bungees, just have the fan sitting on a thick towel, seems to reduce vibration to the floor. (in a room)

Ya I've seen you post this before, I was just curious about this stuff that I had. I'll head out today to find something with SPINOSAD in it! thanks for your help! +rep