where in the net pot does the rockwool sit?

i am trying a 5 gallon dwc grow , 1 plant for the first time. i understand the general idea. the only question i now have is. when i fill the netpot with hydrotron rocks. how far down am i placing the cube.
do i just place it on top of the full netpot. or am i only putting in a few rocks and basically having the cube at the bottom of the pot? thanks much appreciated guys

pour in some hydroton then in the middle of that set the rockwool then around that put some more hydroton

yeah but does it need to be close to the bottom of the pot? does the water need to bubble up close to the roots? or do the roots sense the water and start to grow towards it? the net pot is wayyy bigger than the cube. its like a 10 inch pot that sits on top of the 5 gal bucket....i have it at the top or a couple inches down but the cube was so dry yesterday that the seelding flopped. so i watered it water into the cube. once the cube was soaked aftyer an hour or so the baby was standing tall again. for a moment i thought i lost it...

when you grow dwc, am i better off just growing the seedling in the cube without the bucket untill theres like 5 nodes?
right now there is the second set of real leafs coming in.

how big is ur cube? I am trying the big net pot lids for the first time. It is hard! I bought them for drip use but I am trying one in dwc. I am using rapid rooters. I have lost two plants trying to fogure how to dwc a plant in a big 8 in netpot lid. I am thinking that putting it an inch abouve the water line and keeping the water line an inch below the netpot or a half inch is the way to go. If I fill the water all the way up the water in the hydroton becoes stagnant and the plant dies. If I place the rr to high up then the roots cant make it all those inchs. What I would do is lower it to bottom and wast wall that space and just check the roots eery day. I mean plop that cube in the bottom of the netpot. Watch the roots grow then to the water. It will take a day. Yu will lose all that space but save a plant. These lids are perfect for diy waterfarm like drip systems. I am going to place a stake in each one with a dripper the run return lines out the bottom of the bucket. For five gallon dwc I am using a three inch netpot drilled into a five gallon lid. It works like a charm. Just got to make that pesky little hole.

thanks bro. yeah the cube is only like 1 or 2 inches by 1 or 2 inches. not sure exact size. but it seems like the water wont make it to the roots. so when i get out of work tonight im gonna empty the rocks back into a zip lok then ima place just a few then the cube and surround the cube with hydrotrons. hopefully the roots will get more this way, because i know they aint gettin shit right now which is why it dried out. its a blz.bud too i really dont want to loose it.
since the plant is only growing in plain water right now is it worth the elecricity using the bucket or should i wait till the plant is larger?

I notice great gains in the rapid rooter when I placed it right over the water with the hydroton surrounding it. Pour a little of the water over the cube while yu are gone at work. Wait so yu can watch it later to let it dry and search on its own. At least until yu get yur system dialed in. It is a pain to learn. Yu dont need the pump on today. Do yu have roots scraiming out? If there are a lot of roots coming out it can def make a half inch in a day to the water. If yu got a three inch pot around I highly recomend drilling or cutting with a knife a makeshift hole in the bucket lid. This way there is no mistakes. That is what I did in the end. These lids are made for drippers I swear. lol. Then just leave the roots above the water by a half inch and the mositure and water below will make those roots shoot! thanks for the rep.

hell yeah. that actually makes it seem a lot easier thanks. im gonna grab a lid tonight. so the roots will really grow a half inch in a day...when i looked at the cube yesterday there were roots sticking out the bottom a bunch of em, but i could tell that the water wasnt getting to em and thats why they were drying out....so everyday i should water the cube right. they dry really fast and its hard for me to guage it without any experiance. thanks man

Read the link below for some more tips.

Rock wool when constantly having water supplied tends to become and stay water logged unless great care is done to prevent over watering. This tends to mean root rot when at the bottom of the pot and stem rot when at the top of the pot. With DWC if there is a constant mist in the air above the water from airstones etc the rock wool would likely become and remain water logged. If the water level was high enough to contact the rock wool it would become water logged. Water logged rock wool has a very, very low DO level therefore it causes rot problems.