This hobby is stressfull to say the least

[Tangman]

Listen to Christy, she isn't steering you wrong
One thing that the books don't tell you , things happen slowly and don't worry, relax and enjoy your tank .
besides the goby could still be alive , they are very good hiders, I got one by buying some live rock at the store and it was like an hour the rock was out of water before I got home and it was still alive, swam out of the rock!