Justinl I thought shrimp because that was the same way I found out I had one. I actually caught the third shrimp getting killed . That was when I realized it was a Mantis shrimp in my case. I also diidn't read that he had his tank running for a few years and yes he would have seen it if there was one. I would also lean towards the Acclimation if it is within hours that the shrimp are dieing but it sounds like he is taking every percaution there. I have a sixline that has taken out all my sexy shrimp.
