15/Jul/2017: looking very promising, the pH is a bit down but I prefer cause the tap water has a high pH so sooner or later I think it will balance. Also after watered I added more soil and some humus and perlite with it until cover the cotyledon.
I grew NL a while back, badly, but the smell after a good cure was like pineapple. really nice.
Are you ppm's accurate? very high for such as small plant. 200-300 ppm would be closer to the mark.
If you under feed your plant, it will take it 3 days to recover, if you over feed your plant, it will take a month. always best to starve your girls and adjust up rather than the other way around.
Good luck. You NL is looking beautiful.
@GH_SOHO, yeah, I also believe the ppm value is high but I don't fertilize with anything (only some humus) so I think (and hope) the ppm values will drop with the followings waterings