thanks for reminding me about this thread lol.
what I did - threw a quilt on the tank and fixed the electrics. turned everything back on and warmed it up to proper temp slowly.
over about 3 hours, one by one the fish flickered back into life - was truly great to see - and coloured up.
parameters were 0 ammonia, 0 nitrate, nitrate had climbed to above 20 but below 40.
so, I guess the deep sleep shut down everything in the tank. what I was surprised by was that there was no spike in parameters at all, even susbequently over the next few days - I would have expected substantiall bacteria die off because of the deep freeze but this did not happen. I left lights off for the day, and kept the tank covered - figured no external stress would be a good thing. Did a water change next day, normal tank maintenance thereafter.
no fish losses - woot - but I don't think they would have survived much longer and don't reccomend the deep freeze as a good option for a short trip away
I think the smartest thing I did was warming the tank back up gradually. I suspect a panicked water change with hot water could have been disastrous.
What I would have done if the power was still out - I truly don't know...perhaps small water changes with heated water over a couple of hourse, and a quilt to keep the temp up, but with no filtration......eek ! (heavy doses of Prime to detoxify ammonia/nitrite as warranted by testing, and fingers crossed I guess)
and thankfully no symptoms of disease as I type this
