Thanks Kief,
the Kali Chinas indeed look some special strain, judging from the two specimens I have.
I think there is a slight problem with ZH clone, as I started 12/12 there seem to be a bit of yellowing on leaf tips(new growth) while all the bottom foliage is healthy dark green. I was thinking of N def but it doesn't make sense as it usually starts from the bottom leaves and brings different kind of discoloration.
Maybe it's related to "higher EC" because I didn't water them for 3 days and soil EC went up.
Or maybe it's because of stress related to spectrum change, now there are only 3000K leds without the 6500K cfls.
I'm just theorizing of course.
Any ideas?
Lights are 25-30cm above the canopy.
Clones were taken outdoors in september and slowly revegged, no sign of any pests is visible.
I think the plants had too much of something, maybe related to ec or ph imbalance.