It looks like the water might be a little high in the DWC bucket but I've only read about it and not done it. Maybe @loopy looper can give some advice for starting out in DWC i know he recommends hydroguard if your doing dwc and maybe since your doing 2 dwc get 2 pumps that each have 2 out-port and swap them. I'm high I know but I mean place 1 air stone from each pump in each bucket so if 1 pump fails you don't loose crop. 
