I am trying to rebuild my AP system.  I have converted to a raft growbed using hydroton clay pebbles for media.  To start seeds, I have placed the pots in a plastic shoebox with water, covered to keep the media moist. So far I have placed seed for Basil, Oregano, Parsley, Dill, Romaine lettuce, Spinach, and a fancy mix lettuce.  The only seeds to germinate were the mix so far. My question: Can…