Yesterday I bought a yellow watchman goby and tiger pistol shrimp and they went into a corner and the shrimp got to work and then I saw the gobys head pop out and go back in so I thought everything is going great until today this morning I woke up went downstairs and nothing was there and I can hear loud clicking noises I have looked everywhere and i can't find them will they make a burrow at the front of the aquarium or will they starve and die please help anyone!!!!!!