Once my check valve failed, tank overflowed in living room, basement wall had huge bubbles of water behind the paint that had to be popped open. It was a nightmareOK so that might sound a stupid question to most but there is a message in the stupidity.
I have lost count of the spillages, leaks , floods and electrocutions I have had over the 37/38 years I have been keeping marines. Some have been through negligence I guess, some just unlucky some failure of equipment and some because my tank was annoyed at me for leaving and going on holiday just waiting to get it'sown back soon after I left to go on holiday which was the case a few month back.
Getting a shock after a heater failed or powerhead decided to allow water into it is no joke either. I love this hobby although it can be a nightmare esp if you live in an upstairs apartment. Marine reef aquariums are also a money pit and difficult to control the urge to buy just one more coral or fish. We won't go into the latest must have piece of equipment. So with that in mind are our aquariums something of a liability or should I ask your other half that question?