The problem I believe, is the aquarium design, as others have stated. You must have some amount of surface agitation to provide a proper oxygen exchange. I see your tank is filled right up to the top, and looks sealed with a tight fitting lid. If a filter, or airstone can not reach the surface and break the surface, your shrimps/ fish will suffocate. Doesn't matter that your water parameters are all within normal range, if you drop your water level a couple inches ,and add a small airstone, all your shrimp should do well imo. Good luck !
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