Drainage in those buckets is gonna be key. Set the buckets into a tray, kiddie pool, or a shallow plastic flood tray would work and cut some 1/2-3/4in holes in the bottom of the bucket, i think my next run i may consider putting stones into the tray to keep my pots up away from runoff, ideally you have a tray that is up off the ground far enough you can put a spigot on it and drain the runoff out of the tray. If you dont alow drainage in the buckets you will get salt buildup if youre using synthetic nutes, makes a good environment for root rot, fungus gnats, im sure plenty of anerobic microbes as well. I also recommend that as the plants get taller and dont need those bottom few leaves that you trim them up and fill the buckets in with more soil, this will allow for airflow across the top of the soil to avoid keeping it too moist and again attracting pests.