How long are they taking? Took me 5-6 days to see some this round for me. But before that it took 4 weeks and I still didn't see any.
Things I did different was I waited until my RW had a lot of roots coming out the bottom(about 2 weeks time) and then I put them in the buckets. So 20 days total time vs 28 days and still non on last try. Thats still not quick enough though.
I also stopped letting my plant see PH spikes by making my buckets a day or two before I switched over the lid, not sure if that aided any, just something I did different. Also gave them a proper feed, which helped. And used mycorrhizae, also helped.