Rapid rooters. Especially for autos. Autos hate transplanting so it's best to avoid paper towel method if you can. I drop the seed right in a rapid rooter cube and leave it in a little propagation tray. As soon as it breaks the surface it goes into hydroton in the DWC setup. The trick is to get it in its final pot before roots start growing out of the cube. This way, you're not really transplanting in any way meaningful to the plant. I've had 100% germination and viability since doing it this way and skipping the papertowels. Best of luck friend!