Heater and Filter Dilemma

With a heater you can turn off light at night. I do with mine but they never get to 82.i think it is like in the wild. It goes down a degree or two at night and then warms up during the day. It does it gradually so I think it is OK. Mine have been fine like this. You can't leave the light on all night, they need dark to sleep as they have no eyelids and also you will grow more algae. Or you can get a heater that doesn't change when light is off. I think 82 is a little warm for them too, I think they prefer around 80 unless medicating then up to 82.mine are about 78 - 80.a which I see is where most recommend.
I have the 2.5 gallon minibows and the filters suck on them. They are not very efficient and can be too strong.. You can either baffle the outflow on the one you have. There are directions on the site somewhere about homemade filter baffles. Or get a small sponge filter, which is what Iddid and the bettas prefer this much better as they are current and fin friendly. It might be hard to fitone in a 1 gallon but look on Amazon for small sponge filters. They run with a air hose and air pump and you can get a back flow valve to prevent back flow of water from tank and a valve for control of air to filter, this controls how much air goes through and how strong the bubbles on top are.

These are my two sense I hope it helps out. Others may say otherwise.

+1 Cerulean

Here is a link to the smallest sponge filter I know of:
http://www.amazon.com/gp/product/B00HYEO8H6/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1
The photo doesn't show how tiny this really is. If you look in my photos (under my profile) you can see how it fit in my 2.5 gallon tank. Cut that tank in half, and this filter would still fit. (But don't add the extra black sponge on top like I did. It did not help the filter at all.)

I had the same problem with a little preset heater getting the water too warm when I had the hood lights turned on. I could leave the heater plugged in OR run the lights, but not both together. If you'd like a small adjustable heater, they are more stable and therefore easier on your fish. I had the Hydor Theo 25 watt in my 2.5 gallon (again, see pics if interested). It fit in there nicely. I haven't found another brand with a shorter adjustable heater in my limited experience.
http://www.amazon.com/gp/product/B0006JLPG8/ref=oh_details_o04_s00_i03?ie=UTF8&psc=1