I use these things all the time and if you dont do the following you most likely will have problems(rotted seeds,sowing too deeply etc)-Here is how to get 100 percent germ rates using rapid rooters.First, germ using the paper towel method with a heating pad set at around 80.When your seeds pop and the root tips a quarter inch or so,1: wet the rapid rooters in distilled water and cut about a quarter inch of the top of the rapid rooter off(they mass produce these things, and the holes are too deep for cannabis seeds-you only want your hole to be around 3 to 5mm deep, and somewhat snug around the seed.2: with a pair of tweezers pull off bits of an unused rapid rooter and gently cover the seed you just planted-this allows your seed to be warm,but doesnt constrict the seed and allows more O2 to the seed.3:gently squeeze bottom of the rapid rooter-these things are like sponges-get rid of that loose water so its moist but airy.4O NOT place the rapid rooter tray(the one holding all of your seeds)into a tray with water in it!!!!Place the rooter tray with the moist rapid rooters directly onto a heating pad set at around 75 to 80 degrees-I do this every single time and usually only have to remoisten the rooters once per day, even in conjunction with the heating pad.Do these steps and they WILL all pop the surface.Sounds like a pain in the ass but the seeds really do take off in these things.Ive germed in rockwool,coco,soil and these things and rapid rooters are definitely the easiest to work with and the fastest.Pour water in tray, make sure all are soaked for a few minutes, then drain off excess. If it all soaks up you didn't water enough.