I understand that by placing less clay balls my ro...

Look fine to me. You seem to still have a few inches of pebbles. Maintain high humidity and verify your PH constantly early on until you get a feel for it. Low PPMs in the range of 150-300 and I’m not sure if you are using R/O you’ll need to supplement with Cal-Mag or if tap water dechlorinate your water using a bubbler like in your bucket for 24 hrs prior to switching your reservoir. You’ll learn a lot from a 6 bucket system. Best of luck and your best bet is to network with those on GD that have been highly successful running DWC.

@jollychap you can make a little collar that sits around the plant and effectively covers the net cup stopping unwanted algae causing light any material can be used white will reflect the light back well Hope this helps