Why the RW as the mane medium? I would just use perlite to replace the RW IMO. The RW is so much more delicate to a certain degree IMO, moisture issues and PH fluctuations as well. I hope you don't lose this strain. If you did what I am saying you could get them going ASAP. A bag of perlight will only run about $7 or so and fill enough pots for those little ones. Also, with the RW medium as your soilless you will need to constantly watch the moisture and ph soak them before you use. Do you have someone to guide you threw the use of this set up? I haven't known of many people on hear using that set up or a soilless bubble set up, though I have herd about it just not read a grow or known anyone who has done one, so you might not be able to get allot of personal experience with trouble shooting . But it is funny, before I checked this post out today I was thinking about the soilless bubble stone set up after listening to the grow report a couple weeks ago. The advise that I am giving you is more general than specific so you have to way it out. If you are really worried about them, I would think about taking them out of the RW and putting them in a cup of strait perlite and hand watering them until you decide what you can do, it should give you some time. Again, this is just my opinion. Hopefully someone can give some more input.
Adieu