wrote:
I recently set up a 10 gallon freshwater aquarium. My submerged
thermometer shows a water temp. of 80 degress without the heater even
being plugged in. Is this too hot for small community fish (like Zebra
Danios) that prefer temperatures in the low-mid 70's?

I have a Zebra Danios and my temps are @ 27c(80f), and he seems to like
it ok.