With hydroponics sometimes it's easier to do the paper towel method. The key is to get them in the grow medium before the tap root gets longer than a 1/4" or so. I use tweezers and very gently grasp the sprouted seed by the shell only. The longer the tap root gets, which usually happens quickly within hours, the more difficult it is not to damage the fine hairs that begin to grow off the tap root. With experience I've been able to, carefully as a surgeon, plant seeds with furry tap roots 1-1/2" long that were already branching out and the seed's shell falling off. Soaking the seeds for a day or two first is a good idea if you're going the soil route described above which also works quite well. Whatever you do, though warmth is helpful to speed germination, too much will destroy the tiny embryos just as they begin to hatch. Don't let temps get above 75 deg.