Looks like i got bacterial infection



Just 1 case frommy black tiger, broken with orange antennaeI'm afraid that is a hard one since often the shell may be opaque. Look for broken antennae.
In my case from 40 yellow fireI have 6 of them like the one in Soothing Shrimp's pic. I isolated them and they have been living just fine without treatment most for at least 3 months, a couple of them for 7 months. I took 2 of them out last month and treated them with maracyn 2 and it did absolutely nothing for or to them. I returned them to their tank after the treatment. Seems hard to believe that a shrimp can live this long if it is a bacterial infection. And at least in my case all of them are males.