I have the same thing in my tank.
It has been in my tank for over 4 years and I have never seen a thing. No shells or anything. AND on top of that... it started in my 20 gallon and moved with a rock into the new tank. I HAVE LOOKED LIKE MAD AND NEVER FIND A SOURCE. But guess what.... it just snapped again while I type ha ha!
I figure if it is a mantis... I would be having some sort of issues with loss of small fish or snails. I do have snail shells... but who does not lose a snail or a few?
I also assume after 4 years a mantis would have to be something of size as it would be obviously eating and growing.
As for pistol shrimp? Who knows.... still no shell traces.
Once in a while I see a "molt" that looks like a big pod.... so maybe thats my culprit.... perhaps a 1/2" molt.
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