I use an outdoor preformed pond spring thru fall. No aeration, just throw some BS eggs in every week.
I get all ages of brine shrimp, from newly hatched, to adults when I scoop them out, feeds everything from the free swimmers to adults, and in between. Start with a bag of rock salt, water and BS eggs, and let it happen.
Bet in Brisbane you could do it all year round.
I like the shallow preformed ponds because they provide lots of surface area (I believe the pond holds about 50 to 60 gallons, maybe 10 deep), easy to just run a protozoa net thru, and it allows for plenty of sunlight penetration, that grows the single cell algae the adult BS need to thrive. Breezes ripple the surface, so haven't needed any mechanical aeration.
Leaf litter collects over time, and tends to cover the bottom of my pond, and the larvae of the brine fly are also occasionally scooped in the net with the shrimp, my adult fish eat them too. The brine fly larvae are contaminants of, and come in with the eggs I believe.