You sound a little perturbed by Simon's suggestion. Please don't be, without full information about the situation, people will point towards any information that are related, in case they are relevant.
Anyway, it IS an interesting theory. Now we have something else to look for when people report mysterious shrimp death when adding new plants.
However, I do have yamato shrimps and crypts in the same tank.
I can't say for sure because I never take note of such events, but I'm pretty certain in the last few years in the hobby, there have been times when I have planted crypts, either new from LFS or from established tanks into tanks that already have a population of shrimp, without experiencing mysterious shrimp death.
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