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I went through this last year. I pulled most of the fish and corals out of the tank and took out half the water. Then I sealed it up with plastic and duct tape so it was air tight, but because the water lvl was low there was an air space at the top of the tank. The fish/corals stayed overnight at a friends in buckets. I left two fish in the tank a wrasse and a goby. The wrasse died, the goby made it. I had a pump in one of the buckets make too much heat and lost a tang and a coral everything else was OK. Were I to do it again I'd tape things up and run an airline into the water. I've lost a few fish due to oxygen loss durring hurricanes and tank leak emergencies.
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