clam execution?

hello, a week ago i lost a maxima i've had for a year. just one day the mantle sarted receding and 2 days later dead. today i come out and my squamosa i've had for 8 months is doing the same thing. water parameters are perfect, no (bad) snails, etc. there was 2 nassarius in the shell, but i'm fairly sure they were feeding on already dead tissue. my question is the gorilla crab i just spotted yesterday killing the clams?
 
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