Do I (or did I) have a Green Mussel?

[solefald]

Found this pistachio looking thing in my tank yesterday. Upon closer inspection, it looks like a Green Mussel shell. Must be a HH, but how did it get there, and where it went I have no idea. I assume mussels don't molt, so someone must have eaten it and the only suspects are Emerald crab and some hermits.

 

 

[FlCandy]

It's dead.

[gbose]

After 2 months, he got a reply. 'Your chickens", it said "are dead".