My first thoughts are mantis. Given the short term demise of lots of snails and the fact the "evidence" is piled in a small area.
Listening for clicking at night and setting up a bottle trap or similar would be my top priority at this point. If it is a mantis, darn near everything in the tank is at risk.
All this is just my opinion, it has no scientific, horrific or other ific evidence or knowledge. <grin>
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