Wickedfish, I'm not buying that. Never had one go missing before. Maybe yours haven't eaten shrimp. I think some may not go after them, & some do..Two of the shrimp have been in my tank over 1.5, molted on regular bases. The last one I put in was as big as him, next morning I couldn't find him or any parts, & mystery had a large belly! I think some may not go after them, & some do. I'm fine with the fact about he's eaten the shrimp, but still can't find the cleaner wrasse I put in tank yesterday! Concernd he ate him too! Anyone heard of that?