Austin nice to see you here xD I followed you on partner of your trip to Southeast Asia and it was really cool! I actually live in China and not many of us from Asia are on here (I’m Chinese-Canadian).
I don’t know much about these gobies except that they potentially get to 6”, send a bit more free swimming than your average Yellow Watchman, not sure if they’re entirely sand-sifting but from what I read a notable portion of their diet does come from microfauna in the sand. If that’s the case a mature sand bed may be required. As for how easy it is to get them eating captive fare I’m not sure so ask around.
What are your plans for your fish and corals and tanks from now on?