CVilleShrimps

what size tanks?

Hello Asianrain, Baby Neos are much more sensitive to water parameters than adults, so it is likely a huge swing in your water parameters that have caused the issue amongst your shrimp. I learned all about this from this blog: https://aquariumbreeder.com/aquarium-molting-process-and-metabolism-of-the-dwarf-shrimp/ Basically: "if replaced water contains higher concentration of salt compared to that the shrimp has right now the shrimp’s shell will absorb the salt (because of Osmosis). In its turn, in order to adjust the saline concentration, the cells will have no intake more water to compensate. As a result, there will be a Cell Hypertrophy. It causes to cell death and eventually shrimp death." This is why it is so important to keep any changes in the shrimp tank small and slow so that if they do affect water parameters, then the shrimp have time to adapt! -SJ

Definitely the stone. ^^ Agreed with OblongShrimp. SJ

I had the exact same thing happen to one of our orange shrimp just yesterday. I Looks just like that. I would love to hear what the community has to say as well. SJ