I've had clicking in my tank for over a year now - and now in the new tank, after the move. Have never seen the culprit, but have a good idea what rock it's in. Not a lot of carnage that I can see - so I suppose it's a Pistol Shrimp or something similar. I just figure if it was a Mantis there would have been a decimation of snails, etc... evidence of considerable violence.
Stange thing though, my Cleaner shrimp DID disappear a little while ago, and it was quite mature...
