Sally lightfoot crab nightmare

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So I had a Sally Lightfoot Crab for about a year now. It usually kept to himself and ate algea and some pods with no issues...

Well now this thing ate my clam, tried to eat my clownfish (Left it with a big scar) and also ate a big turbo snail. I have to catch this thing quick...

Does anybody have some ideas? I want to avoid ripping all my LR out because of attached corals, ect..

Has anybody else had problems with these crabs?

Cheers,