Quote:
Originally Posted by SeaHorse_Fanatic
Not only was your tank reasonably heavily stocked, the fish you kept were mostly large tangs and other species that require heavily oxygenated waters to thrive. Once circulation was lost, these large tangs would have been the first to go and then it would have been a cumulative effect in a very negative way since each death would have depleted the oxygen level even faster and create a dead zone at the bottom layer of water, which is of course where the living fish would settle to conserve energy (Murphy's Law at work). Without the energy to stay near the surface, those fish would have been the next to succumb to oxygen deprivation. This is my theory of what happened in your tank.
Anthony
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Here's a vid of a friend's tank (Cabinetman) who posted earlier in this thread. This tank went without power for over a half a day and its full of big tangs:
https://www.youtube.com/watch?v=3PEHCTBfDXQ
From his post on pg 2: "Something ain't right. I don't doubt she had a mass die off but I don't thing 4 hours without power did it. I've got 3 times the bioload and I've had power go out for half a day before and I lost nothing. Id like to know what really happened."
I don't think o2 levels drop that fast to fatal levels (1 hour or so as OP claims) when this tank went over 12 hrs with no
fatalities.