In article .com,
Altum wrote:
I introduced a bunch of Amanos once and over half vanished. I found
"shrimp chips" on the floor when I swept a couple days later. Amano
shrimp are great escape artists.

Those could be moult cases. When they mould they leave a complete
shrimp exoskeleton behind. Dead shrimp are pretty distinctive - they
turn pink - just like the ones you eat! :-)

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