yes, that is called a "bolt-hole." each will find onee. i got two rin from MA cartimar kagabi. its the last two of their batch of 30. so medyo napagpiliian na. binili ko na rin yung dalawa. one down, one to go
upon the investigation of CSI Quezon City, it was found out that the firefish died before being eaten. The goby is just having free lunch. either that, or it thought the mouth was a bolt hole.
problem ko, i realized my QT was broken. i wanted to place it there muna. i was forced to put it kagad in display tank after two hours of acclimating.