I've cloned countless clones and alls I've ever used is a clear gargage bag, to make a mini-greenhouse, #2 powdered rooting agent and some rockwool, 2" X2" X3". I use two, four foot cool white flouresent tubes for lighting. I make a shelf 2/3rd's of the way up the wall(because it's warmer there) and I hang my light over it 24/0hr. I make a drainhole/airhole in the lower part of the bag about the size of a tooney. I use one layer of gravel to prevent fungus and mildew. Other than the hole, seal the bag after you give them a good spray with clean water to make sure the cubes are full and give them some time(not much) to air dry. Your clones should be ready for the hps in 5-7 days. To do a lot of them all at once I employ a small childrens splash pool, some clear poly and six four foot cool white flouresant tubes etc.