Honestly, I would try using rapid rooter plugs for your seeds after they start sprouting and put them in a seedling tray with a dome and put that under a fluorescent grow light that you can get at wal-mart in the lighting department for 10 bucks. I have always started my seedlings this way and then put the rapid rooter plug in the hydroton which is already set in a drip ring system or a deep water culture system with ph balanced water. I stay away from rock wool cuz of the whole root rot issues I have heard about. Rapid Rooter plugs never fail me ever! And all you have to do with the seedling tray is keep the plugs moist with daily check ups. Those seedlings will thrive like hell underneath a dome with all the humidity. Once their roots start penetrating the rooter plugs, you can move them to your grow system of choice. Peace! A bag of rapid rooter plugs runs about 15 bucks for about 40 plugs.