Thanks for the reply!

Yes, these are going into a dwc system. I used the A-OK plugs (1"x1") with a very light solution of Hormex. The seedlings look good, but just no roots.

I've also noticed that the A-OK plugs are drying out quite a bit over a 24 hour period. I am re-watering them when they are about 80% dry. Could this be causing my problem?

Thanks again!