Lost power for over nine days due to hurricane Sandy...No filtration or heat for my 29 gallon tank for over 9 days. I dropped fireplace heated water bottles for the first 5 days. Barely kept the water temp at 71. I got desperate on day six and added warmed water directly to the tank just to keep the water temp up... Long story short, after nine days I saved my 3 platies and 4 catfish...Unfortunately lost 4 tetras. But I have to admire the surviving fish. It became a full time job but well worth all the work. Ten years ago my first fish were platies and I will always find a warm spot for these fish.