Ok this may sound strange or maby not .Saturday I got two mechanic gobys I already have 5 blue damsels and 4 zibera damsels 2 clowns 1 tang 6 snails and 51 hermit crabs. all seemed to be getting along very nicely in the 125 gallon tank. None of the old guys seemsd bothered by the gobys, both about 1 1/2 inches long .Well tonight my son and I where watching a hermit crab change shells and there where still 2 gobys. Then we sat down to dinner and about twenty minutes later there is only one goby and no sign of the other. We sit by the tank at dinner we sall no feeding frenzy. I know that these gobys will go under the substrait, did he? The other dosen't seem interested in the bottom of the tank yet. Did my damsels get a $11 dinner?They don't seem to even care about the other goby.They just chase each other around. I know they can be agressive and the have already bumped off 4 yellow damsels ,but they don't seem to challenge any of the fish that aren't damsels.What happened to my goby. (I knew I shouldn't have named him)