How Large to Emerald Crabs Get

[slammy16]

Was just wondering how big they get. I have 2 in my tank and the first one i purchased seems to have almost doubled in size he looks huge, With him getting so big i was starting to get worried about my smaller fish. Will he get aggresive on smaller type fish or are they just pretty peaceful critters?

 

[mudplayerx]

The largest emerald crab I've seen was the size of a quarter... but that doesn't mean thats as large as they get. They are pretty peaceful as their claws are designed for pulling up algae and detritus. Notice the disk-shaped devices on the tips instead of pointy ends?
My emerald crab like to sit in the pulsing xenia and he never hurts it at all.

 

[wax32]

I've seen them with claw-spans of 4" across if they hold out their claws like wings, which they do sometimes!

 

[gfk]

im about to go get one right now, gonna trade my flame scallop in since ive recently read more about them, ie mine is hiding and i dont want it to die since i cant spot feed him