In nature they eat some algae,so I would feed him something that has some in it. I don't know if you get San Fransisco Bay brand foods down under but they have a brine shrimp enriched with Spirulina. They are sifters like the other Amblygobius sp. but IME A. rainfordi and A. hectori don't sift the sand nearly as much as their cousins. All the Amblygobius sp. gobies I've had like to pick at hair algae.
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