I had noticed my shrimp picking at my new crocea clam and freaked out a little because for 1 it wasn't a cheap clam and 2 I was worried it might be dying. But after watching a bit it was obvious that the shrimp was just picking at the edges of the shell and was leaving the mantle alone.
I recently had a snail dying on me and knew it was dying. My shrimp never touched it until was pratically dead. I figure they won't bother other organisms until they know they can get a safe meal (= pretty much dead).
Rory
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