Just wondering for the future; how well does heat distribute in an unfiltered tank? How do you keep cold spots from developing? For example, one time the filter in my 10 gal malfunctioned and I had to turn it off for the night. When I stuck my hand in the tank in the morning, the bottom was icy cold while the area around the heater was warm. I wouldn't do this for a 10 gal, but maybe a 5 gal...how evenly does that heat?
Thanks! I'm sure you can tell I've never had uncycled tanks, but I'm curious to this aspect in case I ever need to set one up in a hurry...plus I don't want any more noisy filters in my room should I need to rescue another betta sometime.