I just finally got set up with heating materials for my colonies, just in time for winter.... (Since half my colonies remain active in winter this is actually useful, lol.)
I had a sad disaster recently where I had put in a bit of dirt in a formicarium, then added heating, and the queen got stuck in condensation and died.
I've heard of test tubes flooding from cable overheating.
I've read Amazon.com reviews of heating cables shorting out or pretty much catching on fire.
What other disasters can happen from heating? What has worked for you or failed spectacularly?