Hmm I have the exact same problem with my seeds. I've germed and they showed a tap root, i put them in the rockwool which i simply sprinkled with water. It's been 5 days and yesterday when I came home and checked them, some of the had white stuff coming out which looked like mush and none have sprouted. This is being done in a hydroponics system from stealth hydro. I'm thinking it's because the temperatures in my room had been a little cold 1 or 2 days (68F) but during day time it's been consistently at 72F and 50-55 humidity. The water I'm using is filtered tap (may this is the problem?) and i've added a bit of grow nutrient with which i sprayed the rockwool as Roseman advised and he has the same system. Maybe it's the seeds, the ones that gave a tap root were freebies from nirvana and 2 were Shiva seeds which looked greenish to me (immature). I got some fresh Afgaani seeds which look great and am germing 2 right now in case my suspicions are correct and the others won't germ, might even try putting them in soil to sprout and then tranfer them to hydro. Any ideas anyone? Thanks This definitely put me in a bad mood last night.