I have had a 14 gallon biocube since May, and the first fish I added was a yasha goby. for the first month or so he was pretty shy, but after adding a pistol shrimp he became very active, particularly at feeding time. Even after introducing a pair of clownfish he would still hang outside one of his holes. For the past week, however, he's become much more shy. While I used to see him every day, at most now I only see him every other day, if at all. The last time he came out to eat was 3 days ago, and after that he's stayed in the rock. I leave food out for him, but he still doesn't come out and eat it. Should I be worried at all? I hope he isn't dead because a). he's my favorite fish and b). I don't really know how to get him out of the rock if he is.