URGENT HELP NEEDED BIG PROBLEMS plants in an Airoponic 36 pot systerm

hi all, im very new to this and need your helpful advice, im having a little trouble with my little girls, they vary in age from a just few days to just under 2 weeks old. All of these grown from fem seeds, the problem im having is some of my girls seem to be turning a little yellow at the tips, but the confusing part is that some plants growing in the same unit are doing great, getting bigger and stronger every day some have the starts of a health root ball apearing from the baskets. what am i doing wrong? How often should i run my pump for in my propagator and for how long? at present its running every 4 hrs for aroung 30 mins, the water is very hard were i live and the ph is off the chart so im using small amounts of ph- to try and control this but for some reason the ph keeps increasing after several hours, could it be that i have the water heater set to high in my systerm if im correct off the top of my head its set around the 26c mark my temp is around 80 and humidity reading 47%.

Im fairly sure what you guys will come back and say, and thats im over watering,

please help guys i dont want to loose any of my lil girls if i dont have tokiss-ass

No photo, no real help, but a guess is that your giving the taller plants full nutrient solution, and thus your tiny plants the same and your burning them with a high ppm.

I don't believe it's over-watering... I've seen people run 15 minutes every hour with small plants... hmmm... what kind of light you using? maybe your plants aren't thirsty enough.... but I doubt it.

check out your system to make sure its distributing water evenly to all plants. you may have to adjust the misters to get to some of the roots. also, some of your plants may be more sensitive to ph variations than the others, especially if you're growing multiple strains.

thatdjsnow said:

I don't believe it's over-watering... I've seen people run 15 minutes every hour with small plants... hmmm... what kind of light you using? maybe your plants aren't thirsty enough.... but I doubt it.

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15 minutes every hour is a nice way to overwater. Disregard this posters information, as evident by his "Closet CFL Journal" in his signature.