Nice set up! The blue drums and black Hansen fittings look familiar, they are great.
My set up is very different.
My bulk tank (Rain water tank) where the Silver Perch live, is fed by rainwater and I have 10 x 200 litre drums (same as yours ) which have yabbies (a few) fresh water mussels, freshwater snails, Rosy barbs (small fish) and structure (red gum hollow logs and pieces) to provide habitat for all the small critters we can't see with the naked eye, I use most of the drums for biological nutrient absorbtion (terminology), some of the drums have increased flow, some less, so that there's niches for those critters that like slow or fast currents and some that like sunshine and dark, I use oyster shells to provide calcium and filtering using a combination of Polyester wool batts etc. It's a simple set up for a complex food web, but I've managed to get things right which is evident because the Silver Perch have bred which the experts said wasn't possible, and the system has been operational for maybe 10 years or so.
I use plants in the water to indicate nitrogen levels, white sweet potatoes (Shoots / stems) atm, I also use the sweet potato leaves to increase the population of water snails, the Perch love them (snails). I feed with compost worms and when I can get them cheap, supplement with cooked Vannamei prawns. ( I cut them into small pieces).
My reticulation system is one pump on mains but if the power goes out, the set-up is sustainable for a good few weeks as I keep the system stocked so that the fish and other critters can live without reticulation. I manage water levels with Hansen superflow valves and any excess water goes to the bamboo. I use the boo for food, trellises, shelter from the harsh summers, wind brakes and kindling etc etc.
Not sure if that makes sense
The reason I don't use the water nutrient on my vegies is that I use a low concentration of salt to keep the Perch healthy and other critters happy.
The vegies get worm juice from the worm far and ........that's another story.
