Who killed my blue legged hermit???

Hi guys,

I have one murder so solve :)

I had 2 blue legged hermits yesterday and they were both doing just fine.

I was cleaning my glass earlier today and saw that one of the shells that blue legged hermit was using is empty. I looked around if he took one of the other empty shells that I had at the bottom but they all seemed intact.

They I found his body that was on the other side of the tank ripped in half :bigeek:

What I have in tank:

2 benggai cardinals
1 lawn mowing blenny
4 torch snails
2-3 bumble bee snails
1 scarlet crab/hermit
2 blue legged hermits (one id dead and can't fine the other one)

Recent additions:

1 Emerald Crab (i think, just a normal green crab without a shall)
1 Scarlet Skunk Cleaner Shrimp
1 Halloween Hermit Crab

Who killed my hermit????