Your setup looks nice. There are a couple things to consider imo. I would wrap those buckets in thin roll insulation to help prevent light penetration. If they are not black buckets, light is def a factor. Also, tape up, or replace your air lines with black ones. Any light leaks will help grow bad bacteria and algae. If you are not using a chiller to keep your water termps low (mid 60's) in order to prevent root rot (pythium), I personally believe it will be a struggle running a sterile or beneficial environment with water temps in the 70's. It's practically guaranteed imo. There are several ways to keep your water temps low, chillers are most common, but a must imo.