The short answer is there isn't much you can do to prevent re-occurrence
Long answer is power bars no matter how cheap or expensive do fail as do anything plugged into them there are things to make it safer to use like a GFI plugged into the power bar or actually plugging only one item per outlet(don't laugh I know many people who do this including a few FW hobbyists) or even a couple of UPS unfortunately its one of those constant back of the mind worries that can never be fully prepared for
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 My aquarium is nothing but a smorgasbord for my cats.....
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