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[trilinearmipmap]

I have had some small isopods in my tank that came in on the live rock, they look quite similar to cirolanid isopods but they did not go after my fish, they seem to be scavengers.

I read that a good way to trap cirolanid isopods is to get some clear plastic tubing maybe 1/2" size, put bait in the middle, then plug the ends loosely with filter floss, the isopods can get in but can't get out quickly. Never tried this method myself though.