Electricity and water don't mix...
Perhaps I have dreams of OSHA inspecting my workplace and finding violations. Anyway, one item I don't see mentioned prominently in the forum,
especially for folks new to aquarium-keeping is electrical safety. I err on the side of paranoia with a self-installed GFCI outlet on the wall by my tanks
and I have my heaters on a strip I shut off whenever I'm putting my arm in a tank. I know all electrical equipment tells you what not to do around water, but honestly, most folks don't read the instruction manuals!
Perhaps and addition to the aquarium maintenance guides "shut off power before plunging body parts into the tank"? Thoughts?
The moral: people with glass heaters shouldn't throw rocks (around the fish tank)