This trait makes them somewhat hard to keep because you need to find them to feed them, and this is a main reason these fish are hard to keep/don't always survive. A long nose hawk can be quite food aggressive so you have to be careful that the hawk doesn't steal all the food.
These gobies do best if you have some Acros in the tank. In nature, they feed on the mucous (and sometimes polyps) that the Acros excrete so if you have some disposable polyps to use in the tank, that would be best.