I have tried to catch a mantis shrimp, that has been in my tank for over a year, many times in the past. I tried bottle traps with shrimp and fish pieces with no success. I recently dropped a whole clam into my tank for a new Copperband to pick at and guess who immediately ran over to grab a piece. I rarely see the mantis so this was a big surprise. Today, I thought why not try a clam in a bottle trap...less than 10 minutes later the mantis was trapped! If anyone wants the shrimp, it is looking for a new home.