Well, any weak shrimps which are immobile (even if you see the legs still twitching) are already ill or dying, so its fair game for other shrimps to eat them... they are just starting the "recycling" task earlier.
The shrimps don't actually kill other shrimps, they just eat up the dying or dead ones.
If you find one type of shrimps getting eaten by other types, its usually because those types were probably in poor condition from the start and were dying anyways.
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