If fruit flies are too big, you need to give them spring tails. The little white bugs that jump when you blow on them, you see them in your potted plants. I don't know about Australia but here in the States there are companies that sell them.
Maybe you can try running a net through a meadow in your area and dumping the tiny bugs with the frogs.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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