Rom,
Dont use a solid rockwool cube, cut it into small 3/8" cubes and pack those loosely around the stem in the netpot until its full. Handwater from the top occasionally to keep it damp. I did a side by side with netpots filled with a solid r/w cube, r/w chunks, hydroton and one with no media that used a neoprene collar. The plants with the solid r/w cube were slow as the roots have to push through the cube, it`s hard to judge how wet or dry the cube is too. The hydroton plants are very susceptible to wilting unless you handwater often or set up a drip to prevent it from drying out. The large gaps between pebbles dont help as they increase the evaporative water loss and that in turn causes a local chilling effect on the roots. With no media in the netpot you`ll have no choice but to mist the hell out of them to keep them upright, at least until the roots are big enough to capture sufficient mist. By then, they`ll look just like lp aero roots so its not ideal.
The r/w chunks are much easier to deal with and do a better job all round. If you can do a side by side, you`ll be able see the differences first hand.
Dont use a solid rockwool cube, cut it into small 3/8" cubes and pack those loosely around the stem in the netpot until its full. Handwater from the top occasionally to keep it damp. I did a side by side with netpots filled with a solid r/w cube, r/w chunks, hydroton and one with no media that used a neoprene collar. The plants with the solid r/w cube were slow as the roots have to push through the cube, it`s hard to judge how wet or dry the cube is too. The hydroton plants are very susceptible to wilting unless you handwater often or set up a drip to prevent it from drying out. The large gaps between pebbles dont help as they increase the evaporative water loss and that in turn causes a local chilling effect on the roots. With no media in the netpot you`ll have no choice but to mist the hell out of them to keep them upright, at least until the roots are big enough to capture sufficient mist. By then, they`ll look just like lp aero roots so its not ideal.
The r/w chunks are much easier to deal with and do a better job all round. If you can do a side by side, you`ll be able see the differences first hand.
So I upped the nutes back up to 415 and went on a hunt to see what deficiency I was misreading. I decided it was probably N so I upped the N (and the Ca because the B part of Jacks is CaN) the roots almost immediately showed new growth and she started to put on some height as well. Murphy was not going to let this go without a fight. Now that shes growing she started to show another deficiency, it looks like Mg this time. I went back and reread some of the threads on Jacks and found that supplementing with Epsom is common so now Im doing that and we will see how she is in a few days. 
