Do you start with soaking the seeds in a jar for 24 hours and then go to the trays?
I have been growing microgreens with soil for the human members of the family and growing lentils, bird seed, and wheat grass in soil for the chickens. I just bought barley seed and tried to do it without soil. I soaked for 24 hours in water in a jar, then did the drain, rinse, drain for a few days after that and then put them in trays. The seeds definitely sprouted. It is now day 8 and there is hardly any "grass" growing. I don't know what I could have done wrong, but they are growing so slow, something must be wrong. Any ideas?