what are you using for light incandescents bulbs???
i was using two 32w daylight cfls, but i shut one off after the 4th day or so to give them a little more shade.
ya i have two cups stacked on top of each other with some holes poked on the top for a little air exchange:also do you have a dome over it?
i was originally going to use some rapid rooters, but i was told it wasnt a good idea to put into a hydro system and was advised to use the rockwool cubes. One thing i should have done differently was soaking it in a lower pH water, I used distilled water and didnt supplement with any nutrients.I never rooted in rockwool I have rooted in peat pucks not harder to root in rockwool.....