I recently cloned about 6 clones off of a Train Wreck mother. I am rooting them in 1 inch rock wool cubes. I ahve them in plastic cups and I am keeping a constant 1/2 inch of rooting solution in the cup to keep the cubes saturated. Most of the clones are doing well. Some of them have a few yellow leaves, 1 or two per plant, only on one or two of the plants and one of them is wilting severly. I havn't tried lowing the water level in the wilting one because it is only happening to that one, but I don't know why. If anyone has any info on the wilter or the yellowing leaves, please reply, thanks.