I don't think it's going to raise the water forty degrees! That would have to be a pretty strong heater. Maybe others can chime in here -- I don't have a lot of experience with putting tanks in cold places.
GarNiac;3734917; said:raphael catfish could work in 10 gall too, get a small one, they take ages to grow, but you may find them boring. They hide all the time and active only when the lights are out.
The fish guy in my lfs told me that they have an 8" raphael, I ordered them, its coming on this wed, lets see if his telling me the truth.
Rhaphael looks awesome when they're big, but would need a larger tank, 30-40 perhaps.