Is the air stone in that bucket working as good as the other 3? If they are old & handed down, it could be clogged, and that one could be diverting the flow to the other 3 instead. They can be duds from the get go as is, let alone being used. Not bubbling enough to saturate up through the hydroton, and into the roots with the mist.. With bigger net pots, you want to run the water level right up to the bottom. Or even up above it for larger ones, temporarily anyway. You shouldn't lower the level unless there are roots dropping down yet, or unless you have a serious air pump, sprayers, drip ring from above, or other means of keeping it moist until it does. I try to pull roots down through the net cups (smaller ones are better IMO) when i transplant clones into them if possible, as it helps to speed up the process. Hope the plant made it!
