Don't worry m8, most common cause of problems for new growers is loving them to death (over watering over feeding, general fussing lol, lights too close)
you have to learn to let them grow and stop fussing over them, with practice it will come
weed plants for the most part are very hardy/sturdy despite all the talk of stress in thread after thread after thread
stress is a cover word for "grower error" lol
less is more so to speak
good luck
Hey man, thanks for jumping in. I should've qualified that..you're right it's low. I was going for about 6.2 at the beginning of the grow, but bought it down because of the high pH of the run-off. It seems a lot of folks are happy running a little under 6.0 in soil.
I'm beginning to think she's suffering from a case of underwatering whilst being too close to the lights, but not ruling out your nute lockout just yet..
Check whats in the bag and compare that to your actual soil and see if it has drifted. I'd say it hasn't. Not by more than a point or 2.
Yes, I wrote it, and yes it will give you the pH of any sample. Glad you understood it!! pH is a real bitch to get your mind around.
Wow, thank you everyone.
Ok, so... no it's not too hot. I learned the 'hand test' a while ago, and it's fine - corroborated, like I say, by a thermometer that is slightly more under the light than the plant is.
It's not wet - or rather it is, because I'd just watered her. I think if anything, she was too dry. Bit embarrassed about that one, but I've only been watering small amounts, which tonight's research suggests is a bad idea.
Riknstein..18 inches? Really? I'm an utter newb (but a sound engineer, so I know how the inverse square law works), but surely I'd lose too much light that way? No? Will you be mortally offended if I just go with 6 or so? Can I ask if anyone else has a similar problem with a 400W HPS at 5 or 6 inches (12-15cm)?
Thanks again for all the replies, guys, appreciate it.
Sweet! Good job man, it was easy to understand. I've read similar approaches before, but they always get over-complicated or confusing, at which point I just assume the author is winging it. So I'm gonna do that this afternoon and see what happens. Seems weird that the pH of the run-off is higher than both the stated soil pH and the water I'm adding. Points to an inaccurate measurement method methinks, so I appreciate your info. I'll try not to hassle you again!
Wow, thank you everyone.
Ok, so... no it's not too hot. I learned the 'hand test' a while ago, and it's fine - corroborated, like I say, by a thermometer that is slightly more under the light than the plant is.
It's not wet - or rather it is, because I'd just watered her. I think if anything, she was too dry. Bit embarrassed about that one, but I've only been watering small amounts, which tonight's research suggests is a bad idea.
Riknstein..18 inches? Really? I'm an utter newb (but a sound engineer, so I know how the inverse square law works), but surely I'd lose too much light that way? No? Will you be mortally offended if I just go with 6 or so? Can I ask if anyone else has a similar problem with a 400W HPS at 5 or 6 inches (12-15cm)?
Thanks again for all the replies, guys, appreciate it.
So...after following the sage advice of all the good folks who contributed here, and a little correct watering, I thought I should show you the result after...what...36 hours of moving the light up (18 inches or so - Riknstein's the man!). Pay attention to Those Who Know, people, and this is what they'll do for you. Huge thank you, guys. kiss-ass
Much better!
see...less is more
and you didn't believe him/us at first... til we all said the same thing
you made the right call
.... but YOU made the right call. Looks pretty good now, huh? And shows you how quickly plants recover.. Have a good one man. 
