Thusly Spake Unto All:

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?

80F that's 27C, right? That's perfect for danios.