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3 weeks old cutting are probably too rotted to root. Get fresh HEALTHY ones. Get the pH around 5.7-6.0, not 7. You should use a sharp instrument and get a clean cut. I've used 2nd graders scissors, gardening snippers, utility knives, kitchen knives and my teeth. While the teeth option...

I would guess your overwater them and the RH is too low. Post your RH and a picture and we could see better what the problem is.

The best thing to do is to put that stupid meter in the trash bin. They don't work in low-clay soils. Check if your plant needs watering by lifting the pot - if its too light it doesn't have enough water. The differences are pretty drastic. If your pots are too big to be lifted jam your finger...

Whats your pH?Whats your temps?Whats your RH?Also, it seems like they are overwatered, meaning they don't have enough air. Try getting more bubbles in there as a start.

Get the stem a bit higher. Rot is happening due to excess moisture and it seems like this place has way too much.

good luck~

if you spray your plants it might be from chlorine or other contaminants in the water. if you don't, post a picture.

that meter sucks balls for clay-poor mediums.nothing like the good old "lift the pot and see if its light" method.for proper testing you want a tensiometer, like this one: http://www.blumat.at/automatic-watering-system.php#bldigital I still like the "lift the pot" method better for pots that...

Gypsum is a 7.5-8.2 very strong buffer. you don't want that right now. if your plants don't show pH issues in veg there's no reason they will show pH issues in flowering.

Tuff Marom Golan with 20% extra perlite.I don't think they sell it outside of Israel though.

my tap water has abundant amounts of calcium and magnesium. You could check if you'rs have as well and just mix 20% tap water in your solution.

At this point? do nothing if there's no ill affects. /If they show signs of pH issues lower the pH of the water you give to the plant. /If you want to fix the pH to reach a certain value - sit back, relax and light one instead. /

Get your temp much higher and it would lower the RH (relative humidity) quite a bit. /You can put your vents on a thermostat to cool the grow only if the temps go above 27°C./ If you tap is 0.2mS EC you should add nutrients to top that off to 0.5mS. (mS stands for mili-siemense which is the...

It creates quite a bit of guesswork as colloids get into the soil and you don't really know which. (soil holds nutrients)Transplanting a somewhat grown plant into a pre-fertilized soil is like constantly giving a balanced fertilizer, which is what the plant needs at this stage. That way newbies...

yes/ yes/ yes/ no- use low nutrient feed with lower EC water / take the meter back to the shop / you welcome / RIU sucks for fucking up the "enter".

until the plant start showing signs of nutrient deficiencies.it depends on the soil, the amount of soil you add, temps, humidity, how much the plant use up etc.

Looks like magnesium deficiency to me.Some plants like more mag when flowering than others.

transplant it into a bigger pot with some prefertilized high quality soil and let it recover for a few weeks before you feed it again (you should start feeding once it goes pale from lack of N)

looks like overwatering and high temps to me.

way too much light, temps too low, humidity way too low, too high EC (you should use distilled \ rain water if possible at this stage).You want the 125W CFL for another week at least, at ~10" above the tops.You want the temps around 27 °C - reduce venting.You want the humidity around 75% (higher...