Rockwool is a tough medium for a noob. It has to be pre-treated to deal with pH issues. I'd start your next batch of seeds in a type of plug called rapidrooters that's made of a spongy bark substance and holds exactly the amount of water the young seedling needs, and can go into hydro. With seedlings, rockwool should ALMOST dry out between waterings but it's such a yucky medium for starting seeds that I can't recommend it for next go-round.

Put seedlings under the light as soon as you see them show their cotyledons above the medium surface. The light should be a flourescent at that stage- t12 tubes are fine. They can go under the halide when they are older and have better roots.

There's a constant-flow system in hydroton and plugs that you might want to take a look at, look under basic growing then grow logs then look for stinkys adventures in noob hydro. It might be on the second page. I've been lax.

Nice thing about rapidrooters is that you can just stick them in a tray under a shop light until you see the roots poke through, as long as they have enough moisture, and you don't have to mess with the hydro system for almost 2 weeks.

Did you SERIOUSLY just bump this post because no one had replied for a WHOLE 5 minutes? Don't do that.