Sudden death

My Bicolor Blenny, my favorite fish in the tank, which was fine yesterday, is now being consumed by my emerald crabs. Does anyone know what a possible cause of death could be. Parameters are perfect. I have a lawnmower blenny that is far bigger than it was and they were fine together for a few weeks. Could this be the culprit? It was so sudden and I have no idea what happened to it.

I just remembered a rock fell a couple hours ago. The fish is being consumed right by that rock. Is this a possibility or are they usually too quick to get hit by a rock?

 

could have been the rock that took it out, could have just been his time, sometimes they just die, really sucks man sorry for the loss K+

 

I just did a small water change to make sure that everything is OK in the tank. All my other fish and corals are doing very well.

 

blennys are kinda fragile sorry man

 

Yeah! Sorry for your loss! K+

 

emerald crabs are opportunistic so the rock may have clipped him and then he just couldnt stay away from the crabs

 

Sounds like the rock took'em out - sorry man! On another note, IMO keeping a bi-color and a lawnmower together could be sudden death too :-[