Sounds like bacterial infection.I have been keeping Taiwan bee shrimps and CRS for a few years now and have not experienced before what I am going through now.
My shrimps are slowly dying off one by one. One everyday for the past two weeks.
The following are my tank parameters:
Temperature 23 degrees Celsius
Using ADA Aquasoil. Tank is 3 months old. Pior to this tank was cycled for 8 weeks.
My adult shrimps are all getting berried and very active.
But everyday now I'm getting one shrimp dying, mostly small ones.