My apartment has radiator heat, so it can get warm. Thanks for the suggestions.
I have a ten gal tank with 3 guppies, a platty, and 10 red cherry shrimp. Some live plants as well. the fish should be good as far as the temp right now, 80F. But it is at the edge of their range. I would like to hover at 78, partially cause our apartment is warm and I am attempting to breed.
The heater has an on/off light, and I have never seen it come on. I guess I'll unplug it and see if that was the problem...