thought I'd share the experience I just had with my Yellow Coris Wrasse. Around 2 months ago I saw he disappeared from my Frag tank. He had made it to the sump but I didn't know it at that time. I drained the water from my tank and sump around 2-3 weeks ago and left the sump sit in the tank stand- no heater, circulation or anything. Then yesterday when I went to remove my sump to clean it out that's when I saw him swimming around. I was quite surprised and quickly caught him and got him into my nano, where he's doing fine. So in total he was 2 months in a sump and more impressively, 2-3 weeks in about 2 gallons of water, uncirculating and at room temp which ranged from appx 65-72. It's amazing how resilient some fish are!