What is your biggest fear in fish keeping?

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About 5-6 years back, I owned a shoal of red belly piranhas in a 120 gallon. I loved these guys to death, having raised them from an inch long to about 7-8 inches each.

I took a vacation to Hilton Head, South Carlina one winter. After a relaxing week and a half, I came home only to find that my house suffered from a power outage. All my piranhas died and needless to say I was devastated.

My biggest fear is a power outage.
 
Mine would have to be leak or blowout in a tank. About 6 or 7 years ago I woke up to a soak and wet cat that had somehow flipped a 10 gallon tank over onto the carpet. Cat was fine, but the fish were dead and the carpet was done for.
 
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