Opinion and Questions

It should be fine depending on the temp in your house. I run a 24 gallon and 2,12 gallon JBJ nanos as well as all of my other aquariums, I don't run a heater in any of them. Thats just me though, just monitor your water temp as you are cycling it and see if its nesessary.

I would be more worried about needing a chiller then a heater.
 
i dont run a heater in my tank but is is a lot bigger than yours if you house gets cold at night than i would get one.
 
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