have had Cirolanid Isopods on the LR I picked up for some time. I have had the rock for about 6 months, and Ive tried a combination of starving the critters and trapping them. Every three weeks or so I put in a trap to try to catch as many as I could, then starve them again for 3 - 5 weeks then put in a trap and catch whatevers still alive, etc etc. This plan seemed like it was foolproof about 5 motnhs ago.. lol. But no matter how long I seemed to wait in between traps Id always catch one a few weeks(or months sometimes) later. About 6 weeks ago I put in a trap and pulled out 10 or so after a month in a half of no trap. Two weeks later I was about ready to just bleach all the rocks so I put in one final trap to see if there were still isopods... and nothing. I have done 4 traps since and have caught nothing. Is 5 weeks with no isopods enough time? In a perfect world Id just wait another two months and keep checking, but time is limited and my display tank has been desperatly needing live rock for the passed 6 months. I have atleast 20 or 30 coral that have been on the edge of dieing due to poor biological filtration in my display, so getting these rocks in sooner then later is a high priority. So I guess the question is, Am I safe after 5 weeks?