Last night when I got home I could see some crayfish shell on the bottom of the tank. I was sad that one of them had gotten eaten.
I looked a little closer, and the only crayfish that I couldn’t immediately see was the smallest one. Looking at the shell pieces I decided they were too big for the tiny crayfish. I moved a couple of the decorations and the tiny crayfish bolted.
One of the crayfish must have molted. Today I asked my co-worker who I got them from and he confirmed that they do that about once a year. Cool.