During 1-3 Nov there was a flooding in my area, 240 centimetres deep. 
Fortunately I could make my 20 g tank float by scooping some water out
and pulled it to the stair landing and let it float there.
There was just a short period of sunlight on it for 4-5 days without
electricity. I thought most of the critters were dead since some oil
(didn't know where it came from, maybe someone's garage) splashed
in there during the maneuvering.
After the water had receded, it seemed all of them survived the event.
However some Amano shrimps were missing during redoing the tank
(as the gravel must be removed to make the tank moveable).
I was sure it's because they were frightened by all the fishes when I put
them all in a bucket and jumped away, not being eaten.
You can see the 2217 canister sitting outside, on the air-con compressor unit.
There were Corydoras fries inside.
Next time I will prepare myself with a big shallow container (for better
gas exchange) as an emergency place for the critters.
Fortunately I could make my 20 g tank float by scooping some water out
and pulled it to the stair landing and let it float there.

There was just a short period of sunlight on it for 4-5 days without
electricity. I thought most of the critters were dead since some oil
(didn't know where it came from, maybe someone's garage) splashed
in there during the maneuvering.
After the water had receded, it seemed all of them survived the event.
However some Amano shrimps were missing during redoing the tank
(as the gravel must be removed to make the tank moveable).
I was sure it's because they were frightened by all the fishes when I put
them all in a bucket and jumped away, not being eaten.
You can see the 2217 canister sitting outside, on the air-con compressor unit.
There were Corydoras fries inside.
Next time I will prepare myself with a big shallow container (for better
gas exchange) as an emergency place for the critters.