Should I be worried?

[fenrir]

Well I got a new red emearld crab 2 weeks ago and he just shed yesterday morning, and he is now triple his original size!

He is now bigger than my firefish and my cleaner shrimp, should I take him back to get a smaller one maybe? I will be upset if he takes a chunk out of my fish or shrimp. I may be eating crab legs that night!
Here a re before and after pics.
Before He is under the fire fish

And after! His claws are huge!

 

[peef]

Emerald crabs shouldn't really hunt or aggresivly attack your fish as far as I am concerned. They are algae eaters so I think you should be ok.

 

[nietzsche]

no, they can be aggressive. i have a large emerald crab in my tank who i have to catch and give away. hes been so aggressive to my yellow watchman goby. he ripped a chunk out of his side, and yesterday he pierced the goby's dorsal fin with both of this pinchers. im tired of the goby being abused like that and just going to take him out and give the emerald crab away
i feed this guy directly and he still acts bad. just look out for the slow moving fish. my goby likes to chill out spots and my emerad crab just happens to be sneaky

 

[peef]

Well, I stand corrected! Git im outa there!!!

 

[fenrir]

Well I called my lfs and they will be happy to take him back for a smaller one. But I will wait and see how he acts. He hasn't done anthing yet, he seems to be ahppily grazing now.

 

[m0nk]

Anything with big pinching claws worries me.