Your tank looks small..and you managed to house 20..squeezy much?
Death to shrimps are attributed to several factors..if it is molting problems it should be gh problem(either too low or too high).
did you cycle your tank well? Test kit is required if you want to keep shrimps. The weak ones might die but not necessary .. it could be your water causing them to eventually pass on. Cherry is relatively hardy and if they dies, it could mean your water do have some problem. please test your water and post your parameters here ..so that we can help you further.
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