Bro, I'm not going to be able to help much with any kind of hydroponics... sorry. They look over-watered to me but, heck, they're sitting in water, so...what do you think it is ,over feeding heat or need to add some more calmag...
To be honest, I didn't know there was a such thing as an hydroponic, organic grow. Is it called that strictly because you aren't using chem ferts? Or, is there more involved?