Daphnia DOA or did I kill them?

DeCypher

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Hello all, almost ten years ago I used to keep daphnia colonies. A simple 10g, I had well water at the time, an open airline, light and activated yeast.
I’m getting back into axolotls and ordered “500+ daphnia”
My setup is a 10g plastic bin, treated/dechlorinated tap water, open airline, light and activated yeast.
The bag was very small and there wasn’t too much movement. A lot of dead or exoskeletons at the bottom. I added the contents of the bag to the bin and fed some yeast. Now they’re all at the bottom and some are barely moving and appearing dead. I can only count a couple dozen live ones. Did I kill them with the transfer? I read about 12-24hr shock possibly. Am I doing something wrong, or did I possibly use a bad vendor and simply got DOA? Please let me know if there’s anything else I should do about my setup, it’s been years and I’m relearning. This small amount of daphnia seems to be okay, many are swimming in circles at the bottom or seem practically paralyzed. Thank you
 
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