I had a power cut today in fish room, tank temperatures have dropped to about 65f and the filters have been off,, whats the chances of the bacteria in the filters being dead now,, I keep big fish and multiple tanks I have 3 fx5 filters and 3 fluval 406 filters and 2 xp3 filters, I have never had a power cut before and iam fearing the worst that the filters are dead they could have been of for anything from 2 hours to 6 hours, any comments welcome