Hi, I just recently got a shrimp and goby pair to put in my 12gal aquapod, they came together and well when i introduced them into the tank they went on their own way tried to put them on the same spot and well left it at that and when i got back from work noticed the shrimp was working on the tunle on its own and the goby no where to be seen, the goby was in back in the sponge part of the back filter i put him back in the tank and at about 730am the shrimp opend the cave and the goby went in, its been the last since i've seen the goby I still see the shrimp working on cleaning on the tunnels but i dont see the gpby on the look out. My queastion is where is he? is it normal for him to hide out for the first couple days to he gets used to it, is he dead, did the shrimp eat him? please help. thank you in advance