I'm curious because I had an incident back in November but my wife & I still talk about it. Her favorite fish which happens to be a Piccasso Trigger was absent from feeding one morning. I thought nothing of it maybe he was chilling somewhere. So the night I get home I still didn't see him. I then decided to throw in some food just to make sure again. After scouting the whole tank I see the mesh on the overflow is missing? I thought its not possible,he cant fit in there (32mm). I then told the wife he is missing,she got upset. Told me to check the pipes and I said but everything is running normal still. After much thought we realised it can only be there (yes she was right). I go to close the ball valve and it wouldn't budge. It then hit me...Not knowing whether he was alive or not I quickly shut everything down and got a torch to see up the pipe and there he was head up (against the flow). He wasn't moving so assumed he was dead. I took the pipe to toilet and sprayed water through but wouldn't move...poked it with a acrylic tube to push it down and still nothing. By then I thought oh well sadly... So I go the garage and unsure if I had extra fittings I pull out the heat gun to try and loosen things up. That didn't happen as the pipes were just softening so I twisted it and as it opened there this fish (called ZEB) was gasping for air. Man I couldn't believe it but just as fast as that thought sprung to mind I was up and running for the sump. I blew air into it and out he shot but he was clearly out of it. Bouncing off the glass as if he were blind. Then I thought i'd put him back in the DT so it would be familiar for him but still bounced along for about 15mins. He came around a little later and back to his usual munching ways. Now there was a big time lapse from being in the water and out. So I still don't know how he survived all of that.