How do I keep my 1.5 gallon fish tank warm without a heater or lamp?

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My betta fish HATES when lights are directly on him, and I haven't found a heater for my small tank (its odd; more tall than wide). The weather is getting chilly so I would like to know what to do on extra cold nights. Thank you.
 
there is know way to keep your 1.5 fish tank warm with out a heater or lamp only if the house is really warm but i mean you have to be sweating and your doing nothing
 
taller than wider tanks are not very good for bettas, they come from shallow waters and have wide territories so when picking a tank for them you should look for a wide tank. also something to keep in mind is it being large enough to heat, the smallest heatable size is 2.5gallons. basically, your tank is not suitable to keep a betta healthy.

I keep my bedroom around 80F to keep my aquariums around 78, so if you want to keep your house 80F you can do it that way, however other than that you'll just need to upgrade your tank (which you should do anyway). until you can, keep him on top of the fridge, it's a little warmer up there.
 
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