let me try to make myself clear (and pardon me if i'm thinking that there are different types of gobies, when there are not)
sand sifter : gobie will actually eat critters found in the sand. possibility of starving if there is not enough benthic creatures available.
sand stirrer : govie just messes around with the top layer of the sand, but will not starve if it can't find enough food, it'll happily eat other things like
mysis shrimp etc. that you feed your other fish.
like i said, this might be a non issue, but i keep finding conflicting information online, and would like to clear things up for myself, so i don't buy a fish that i can't keep, basically got a new tank with a DSB that only has bacteria in it, nothing else.
but i like to start out with a bobie that will keep the top layer stirred up and keep crap from settling down in one spot.
J.