Phew that was close!

[neoh]

Grab one of these leak alarms:



If you don't have one (or two) already, that is. I saw them at Rona for under $15.

I have one in the sump area, as well as behind both ends of the tank and beside the RO in case of an emergency. They squeel real loud and will dart you out of bed if something should go wrong again.