well, having a sump increases the risk a bit. Do you have the tank drilled or external overflow? In sump skimmer of hang off back? All return pumps with hoses have hose clamps? Does everything stay in the tank when the power is cut?
Assuming you have an internal overflow, all equipment is contained in the sump and all hoses well secured, you should be ok. These are the typical causes of floods.
Make sure you have your overflow intake protected from blockage by snails, debris, etc. Water not going out and sump coming back in can cause obvious problems.
Powerheads can slip and point out to the couch, so make sure they're well mounted.
I'm sure others have come across other causes, but mosrtly you should be ok. And if you have a flood, they're generally easy to clean up. You might need to rent a steam cleaner if the tank sits on carpet, but serious water damage isn't too common.
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Brad
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