New snails may die very quickly is their acclimation is too brief. It could be that the snails are already dying, and the hermits are doing what they do by instinct. Also, do you have extra shells for your hermits? They are always looking to trade in/upgrade, and when there are no empties available, they resort to murder.
As for the clown, is changing the layout of the tank doesn't work, one of them will just have to go. It sucks when he animals dont go along with our ideals, but what can you do?
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