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Are you sure it's not hermits killing Astrea snails? I keep two extra shells per hermit in my tanks, and I haven't lost a hermit or astrea yet (going on four months). Or it could be a hermit killing the other hermits, which isn't uncommon. Is there plenty of food for them?
Nassarius snails won't kill hermits. I don't think they could if they wanted to. That is quite a few hermits for that size tank though; I stocked 2 scarlets and 6 blue legs for my 34g, and it seems to be a good fit. The scarlets have gotten BIG and hungry.
Also, what kind of water are you using? RO/DI? Copper will destroy your hermits even at the smallest amounts.
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