They are hunters more or less, which will also munch on detritus in the substrate. However, they need meat to survive, so if you intend to feed them with the earthworms next time, make sure you purge the earthworm of their droppings first and then you can chop it up into smaller pieces. Once the Assassin Snails latch on to the scent they will come over to investigate. The Assassin seems to hunt via using the long proboscis to pick up a scent. However, it may not target snails of its own species. It seems to use that proboscis and then it's own foot to peel open the other snail's trapdoor. Then the proboscis goes in to literally suck the other snail out. At least that's what I observed from my own Assassins at the time.
If you want a tip, get some Ramshorn Snails and set up a tank just to breed snails as food. I had a tank overrun with Ramshorn in just 2 weeks, which was then cleared by 5 Assassin Snails in just 3 weeks.
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