First Auto Generation from the Sanctuary

So a couple of concerns this week, I've started it by over watering them, I thought I was supposed to water the whole pot but after some reading found that the roots wont suck up the water and it'll make it harder for them to get oxygen, so I've let them dry for a few days, then watered them properly on thursday and then again yesterday. When I overwatered though I was able to test the runoff of the water and its pH was at 7.2, which is worrying because I had been watering around 6.5, so the last two times I've watered them at 6.0. Haven't got any runoff the last couple times 'cause I'm trying to be gentle but I hope this issue was fixed. Now lets go over each one of the girls NL seems to be struggling beautifuly to survive and I'm rooting for her (pun intended), but I'm not sure about her growth. By the middle of the week her stalk started to go really thin in the middle (as if someone squeezed it) and it's been having a timid growth. I've put some soil around the damaged part of the stalk so it would help the plant hold itself up. On the bright side, her true leaves have nice colors and she's growing tiny little second sets so there's still hope (although I don't know what those yellow cotyledons mean). GG #1 had some trouble this week, I guess she took the pH alteration harder than the rest of the plants (possibly as she was the biggest at the time) and by the middle of the week showed really light colored new true leaves showing up, as well as two spots that appeared on one of the leaves (which I'm thinking might be some bug's bite cause I found one there the same day it appeared). However after the pH correction she's showing better color on the growth of the new leaves and looks like it's going to be fine. Destroyer is this week's sprinter, growing perfectly over the past days and GG #2 is just as pretty with its new leaves showing up real good. I think I have too much negative pressure in my grow so I a new cooler fan to boost some more air in, still haven't put it up though. Tomorrow I'm giving them their first nutes, starting with a temporary local root booster I got while my Tarantula isn't here and a little bit of sensi grow A/B, wish me luck and any tips are appreciated