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There's a type of worm, oeneda fulgida (sp?) that only eats inverts. They only come out at night, and they retract at the slightest amount of light or vibration, so are often very hard to see.
The one clue they routinely leave behind though is a tell tale blob of mucus surrounding the dead invert. (which is how they suffocate/paralyze their prey)
If you start losing inverts for no obvious reason and see globs of what looks like snot near the empty shells, that's your likely culprit.
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