From the speed of the tank crash I can only guess that even though all looked well that the tank was red lining on Dissolved oxygen content already and the power out pushed it over the edge.
I didn't hear a mention of a protein skimmer, and maybe surface agitation wasn't sufficient to maintain high enough levels of dissolved oxygen for the amount of bioload to sustain them once circulation stopped.
Although the bacteria would have been the last thing to die rather than the first, and probably via ammonia spike rather than lower lvl's of oxygen
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