"reefman MC" wrote in message ...
I saw him catch the smaller of the two. I stopped him from killing the
maroon. When i woke up the next morning the smaller maroon was
completely gone. Within a week the larger was gone. I found his dead
body in the crabs mouth. I'm 99.9% sure he killed both of them.

Here is what I found about emerald crabs on reefcentral.com:

"Emerald crabs are often misidentified, and while some
predominantly eat algae, others don't." - Ron Shimek