The most efficient and least wasteful way to make this system would be to add filter media layers to the drums (lava rock/hydroballs, activated carbon, sand, & filter foam/floss) Then have the caradina/neos overflow into 2 separate pans completely isolating both systems, then you can have the "waste water" pumped into the large drum filters/reservoirs Sidenote: you could use the reservoirs to grow pothos or some other fast growing plants to purify the water even more
The most efficient and least wasteful way to make this system would be to add filter media layers to the drums (lava rock/hydroballs, activated carbon, sand, & filter foam/floss)
Then have the caradina/neos overflow into 2 separate pans completely isolating both systems, then you can have the "waste water" pumped into the large drum filters/reservoirs
Sidenote: you could use the reservoirs to grow pothos or some other fast growing plants to purify the water even more