Your plants dont ever get overwatered really, they get under oxygenated. When you ater em too much in soil they cdrown in unoxygenated soil, no air in the dirt.
In hydro they are constantly being given air. That is what it is all about getting more air to the roots. The airstone gives the water alot of air to hold that dirt could not. So in only water being oumped full of air they get alot more air than they could in dirt, that is what maes them grow so well. more air.
they get under aired then they die. too much water too dirt does it. airtones in dwc a must! Airstones for other things just nice as the movemnt of the nutrient water gives the air.
we give hydro nutrients a secial set of assests in their mix to give the water the properties of soil. Mae sure you buy hydro nutes. Gh 3 part is the most used. But advanced seems to be everyones fav along with fox farms. Also canna nutes is a 2 part deal so less chance to mess up. The astronaits use GH 3 part micro, grow, and bloom.
what will your medium be? Dwc,, it sounds like.
You can transplant form dirt easy. Carefully remove the pot and gently wash off the roots in water, ro water, carfully clean all the roots then lay into your netpots or whateber hydro mediumm you have chosen. Lots off peeps use netpots an hydroton or any other fast dry media. I suggest dunking your plants in a bowl of water sotly to clean. Try not to tear any roots as that will damage and use superthrve in the water. Let them big enough that transplanting them wont hurt too tiny of roots, waht the guy above me said
any questions ?