ROFL. Love the picture! Since you took the effort to do that much I'll chime in...
You're at the "make it or break it" stage.
This is the stage where if the seedling doesn't send that little root in the water, it'll just sit there. It'll probably die.
So, how do you coax that little bastard into doing something?
Well, first of all, that little root will only move if it can find an environment that is better than the one it's in. Since it's just a seedling and has enough energy to go for about 2 weeks, its only goal is to find water.
SO, if it is sitting in a rockwool plug that is heavy with water, absolutely nothing will happen!
You first step is to assess whether or not the net pot has an excessive amount of moisture inside of it. If the rockwool plug is heavy, gently pull the plug out of that net pot, so as not to damage that delicate little root, and give that plug a firm shake. Jerk it around a bit to pull all that extra moisture out and return to the net pot.
Gently place the rockwool plug and place the root at the bottom of the net pot, to expose it to the mist from the bubbling beneath it, and cover with the geolite.
Which bring me to my next 2 questionw:
How much is it bubbling? And how close is the water?
From your illustration, it appears as thought the water is a little too far away for this troubled plant. You want about an inch of clearance-- the bottom of the net pot to the h20 level. Half inch is best. But not touching the net pot.
Those little splashing bubbles will coax that root into the water, which you need to adjust.
Ideally you keep your ph around 5.5-5.9, as k gets locked out when the ph goes above 6 in DWC/Hydro.
Ph'd water isn't THAT huge of a priority right now, believe it or not, since all that little root wants to do is find water. But adjusting the ph will not hurt, as well as adding a minimal amount of a vegetative blend of fertilizer. Again, that's making the water more attractive than that wet rockwool cube!
Good luck
