That's an insanely long programmed outage. Especially in the winter, I live in a house with no insulation, and have a baby on the way; she would freeze this time of year with no heat.
I agree though I think if you can manually agitate the water the o2 will be fine. I had to seal my tanks 100% air tight for 4.5 hours when I fumigated my house, my fish did fine with just an small power head making agitation. I would worry about heat loss for 9 hours. I think I would try and warp my tanks with blankets in between agitation sessions.
I agree though I think if you can manually agitate the water the o2 will be fine. I had to seal my tanks 100% air tight for 4.5 hours when I fumigated my house, my fish did fine with just an small power head making agitation. I would worry about heat loss for 9 hours. I think I would try and warp my tanks with blankets in between agitation sessions.