I finally got approval to set up a tank at work but I'm limited to 1gal and no heater, going to use this tank I already had. Set it up today just see what the water temps would be before getting a fish. Originally I'd planned on getting a betta but without the light on, the water temp hovered around 71 and this seems too cold for a betta, but then I've never kept one before. I can't think of any other small-ish fish that would do well kept individually. If it helps, I'll also be adding 1 or 2 small plants. Any thoughts on what fish might be happy in this little home?