Right, well, my grandmother had a betta that lived FIVE years in a bowl with no heat. Did it live a long time? Yes. My grandmother's house is very stable in temp, and she keeps the temperature high. But cases like this are the exception, not the rule.
You can keep a dog in a 4 ft x 4 ft pen in the yard with a shoddy shelter, but no one wants to subject that animal to conditions that are far from optimal. Why keep a fish in conditions that are far from optimal?
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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