wow, id really like to see ya catch it, so we can get pics...
id hate to see you kill it, not only since its a senseless death, but whats the chances its not a mantis?.. is there still the possibility that it could be a pistol shrimp?
it has to be eating something... are any of your fish or inverts missing?
The chances are slim it is not a mantis because I looked at lots of pics today but if I could design a better trap that just covered his hole so he couldn't get out AND he would be trapped that would be the way to go. I'm scared that if the hole is uncovered altogether he's going to hurt somebody.
Honestly there are so many snails and crabs I wouldn't know if anyone was MIA...I have lots of empty shells for them to grow into so I can't identify dead guys that way either. I'm open to other trap ideas. Just need it to cover the hole...