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In my experience, crabs like that won't rest until they've killed every snail in the tank. I once witnessed a crab kill 3 snails in one day and change his shell 3 times.
Oh dear . I guess I've been lucky to date, that hasn't happened to me yet in 18 months. Two hermits, three bumblebees, and three ceriths.
I guess my four hermits are content at the mo
I've had many types of snails and many types of hermits. One thing always ends up happening, I run out of snails and finally I run out of hermits. My tank is littered with shells. Next time I put it together again, it's only going to be snails for this very reason.