How long can my fish stay like this?

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Oscarr19

Aquarium Advice Addict
Joined
Jul 12, 2011
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Location
Canada
Made the switch from gravel to sand but the water is a little cold and cloudy. My fish are in a 30G bin with only about 2-3 inches of water. I had to remove the heater and filter back to the actual tank. I have to leave for work and won't be back for about 12hours. I have 8penguin tetras, 3 otos and 6 leopard cories.

The reason they don't have that much water is because I used some of the old water to put back in the tank. I'm hoping the water heats up before I leave in about half an hour.
 
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