Get rid of emerald crab?

[Tank Fan]

UGH! So I just saw one of my emerald crabs chowing down on my toadstool. Is this normal? Could he be the culprit of the quick death of my welso? See before/after photos.

Can anyone suggest a good way to catch this murderer? I want him out! ;Rage

One last question.. should I take precautions and get the one in my ultra rock anemone tank out because I have sexy anemone shrimp in it?

 

[((FORDTECH))]

Same thing happen to me emerald was eating all my toadstools

 

[ssster2020]

I put 2 in a week ago, I haven't seen them since except that someone devoured an Acan over the last couple of nights. TBH that Acan wasn't well and really hasn't grown. If I see any of my others attacked I'm going to have to get the crabs out. I got up in the middle of the night hoping to catch them or him in the act but no luck. Any ideas on how to catch them?

 

[Baldguy]

I had one climb on top of a duncan colony and proceed to start plucking tentacles off. Some he would eat others he would just release into the water. He made the sump his home till he died.

 

[PanchoG]

Emerald crabs turn to the dark side once they are big, transfer him to the sump or re-homing are the options.
I am not keeping emerald crabs since 3 years ago, it is too much trouble for a guy you hardly see.