Evan,
My goby eats anything I give him, but won't come out very far to get it. I have to fire it at him with a tube. Even though he's been with his tank companions for over 12 months, he still gets freaked by them when they also come in to feed. Or he just freaks himself. Even though I feed him in the same place every morning and every night he forgets from day to day and waits somewhere else.
He lives amongst rocks and has no burrow - the tank has a shell grit substrate which might make it difficult for him to dig.
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ATJ
http://atj777.tripod.com/