Hydroponics always includes aeration so the roots can breathe periodically. The water may ebb and flow, be sprayed, or aerated in some way. If your cuttings are submerged long enough with no bubbles or aeration, rest assured they will “drown” too.
Sauce: Grown weed indoors for over 10 years. I prefer “soiless”, and let it dry out enough to breathe between waterings.
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