What kind of cloning system are we talking about here? Can you give us more info?
I started out with the "Pepsi Domes". I cut the bottoms off of Pepsi 2-litres and used them as individual domes.
The medium is FFOF soil in 16oz cups.
When I ran out of room I added a big red tub from Wal-Mart ($4).
When I ran out of room again I started also using a small styrofoam cooler (not in pics).
For the Pepsi Domes I put them in a 14" saucer and fill the saucer with water and treat the water with Hyrdrogen Peroxide to help combat mold/mildew.
In the Tub & Cooler I put water in the bottom of them, treat it with Hydrogen Peroxide, and put the cups in the bottom of them with saran wrap over them.
In the Pepsi Domes it's a constant 99% humidity and mid 70s temp.
In the Cooler & Tub it's a contant 80% humidity and right at 80 degrees.
And I did't put holes in the bottom of the cups since they're sitting in water. I water with 3/4 cup of water every week or so. The top of the soil never dries out so I don't want to over do it.
I have four 32w 4' fluoro tubes. One 3,000k and three 6,500k
And I think I've seen new growth on most of them. It's hard to tell though since there are soo many of them, plus I've been spending a lot of time with the ones in veg and upgrading the veg/flower room.