Hey Jack, you can absolutely over water in hydro. If the water level is too high the plant will start to drown. I ran into the same problem because I assumes it wasn't possible to over water in hydro. You could take a half inch of nutrient solution out to let the base of your root system and your root plug/rock wool/seedling holder dry out some. This will help prevent further damage more quickly. Or you can leave it to level itself out through the plants own feeding habits. Good luck!

Thanks gbd, After you suggested over watering I let the res drain a little and the problem seems to be abating. I was filling the res a little higher than last grow. Hopefully you've nailed it. I'll let you know.
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