Okay I could really use some help. I'm using a hydro system, BUT I couldn't find those clay rocks for the life of me !! I remembered seeing someone with a system like mine using soil.. So I followed suit. Filled the tub with water , packed soil into the cups and sat my jiffy pellets inside. I don't see why it couldn't still grow this way. I don't have an air pump in the container just an air stone and I don't think anything can get stuck in it. Hopefully this goes well. Any help, or insight would be really helpful.