You can take clones up to 2-3 weeks in flowering, not advised, but you CAN do it. You obviously got them to root so taking them from a flowering mom isn't your problem. You see when you take a clone that is in flower it just could take longer for it to develop roots. Hydro roots? Never heard of them, but 6-9 inch roots are damn long. I put mine in soil right when the roots start getting secondary growth.