Is your beta still alive? I have wanted to take one into the classroom but have worried about it getting cold over the weekend & dying.
Yes, we've still got him! I've even left him over long weekends and he's been fine. But we are on Maui, so I don't have to worry about it getting cold. I'm pretty sure they can't live in extreme cold temperatures :(
Bettas are hardy. Mine goes the weekend without food and does just fine. I do have an aquarium lamp, but as long as the water temp doesn't go below 66 degrees it should be fine. (I'm in MN)