I have a 2 gallon tank that a friend gave me and when I had my 3 gallon I put a heater in it and it was extremely unstable. I'd like to put something in the 2 gallon but I'm not very confident in heaters for tanks that small anymore. The problem is my father keeps the house at about 60 degrees all year around and that's on the freeezing side for most fish. Is there anything I could put into a tank that size and with the temperature around 60? It sounds highly unlikely but I'm new to this stuff and there could easily be something I'm not thinking of. Thanks!