i'm no expert, but i put mine in the hydroton after i got about 4 leaves, then filled my rez up to the bottom of the rockwool in the net pot. it stayed moist untill i saw roots. then i lowered the rez.
hey vo, let me ask you a question. do you start counting your veg when you put your sprout in your hydroton or when you see roots through the hydroton? if that makes sence.