Hi there,
Currently, you can dose it with non-copper medicine (though i don't remember seeing any shrimp medicine before) and monitor them. Take note if there are anymore infection in the healthy ones. Unfortunately, prevention is better than cure in shrimps. I also think that it is more cost effective to restart your shrimp colony. Do clean up the tank to prevent linger bacterial infection!
It is hard to know what went wrong without knowing the situation in the worm infested tank. Although hardy, neocaridina do not like water parameters changes especially temperature. Some people do drip acclimatization for shrimps (ultimate fail-safe method in my opinion). When i used to keep neocaridina, i just float the bag of shrimps in water for 30-60 min then scope them out and put them in my tank.
Every tank with substrate probably have detritus worms. When you can see them means they are breeding like crazy due to overfeeding. You can feed the detritus worms to most fishes actually.
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