My saltwater fish wont eat?

the goby should get all his food from the substrate.it should be live sand.thats his job,keeping the sand sifted.they're kinda like mandarins.they do best in a live rock/sand invironment.has he taken flakes and brine from the water column before?the goby is the hardest fish out of the three to keep alive for long.if hes sifting sand-hes eating.the other two are a mystery.they should have been eating right away.now you moved a 10 contents to a 30 right?so you made up fresh seawater to make up the difference,right?is there considerable rock and sand in there?are you sure theres no ammonia spike?we could use some more info on whats been done.like the other guy said,give them another day to relax.don't feed them right now.what do you mean dirty rock?take a 1/2 bucket of the tank water and swish the rock around in it to clean the rock then put it back in the tank.do the white things look like tiny bare trees?if they do thats good.if the sand was dirty when you made the switch,the detritus could be settling on the rock.