Goby & Shrimp Not Eating?

[Chipmunk]

So I just got this highfin & shrimp pair.



Problem is after they build their home, they don't seem to want to come out at all. The fish eats brine when he doesn't have a tunnel to be in, but once he's in there, he doesn't come out for food when it floats by and you can't see either of them at all. Should I be worried about them going hungry or will they come out to feed when they feel like it?

Anyone have any experience with how this pair acts as they get used to the surroundings? Theres no other livestock in the tank other than blue legged hermits.