I start all of my seeds out in rapid rooters and I just transfer the whole rapid rooter into my net pots, I put about an inch of hydroton into my net before I drop the rapid rooter in, this keeps the bottom half moist, but not so wet that the taproot drowns... I've found I don't have to top water my seedlings because of this, as soon as roots pop out of the bottom of the rapid rooter, it goes straight into the hydroton and the tub. I also maintain the same water level all throughout the grow... about 1-1/2 inches below the net pot.