Is cold water bad, or even deadly, for Betta fish? If so, how can I keep my

May

New member
fishes tank warm enough? I heard somewhere that beta fish like water room temp. or warmer, and whenever I clean out my fishes tank, he always seems to swim faster and be more playful when the water is a little warm. The only problem is my house gets VERY cold at night and when I am away. His water gets ice cold. Does this harm him? Or does it not really matter? Also, what are some tips to keep him happy?
 
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