Have not seen this mentioned here but under all of my tanks I have placed a small water alarm that I picked up at Lowe's for around $12. If the contacts on the bottom of the alarm gets wet, it sends out a very load alarm that will wake even the deepest sleepers. It saved my tail when the back blew out of my 110G SW tank at 2AM. It's called a Watchdog and is usually located in plumbing or by the water heaters. Oh, it's battery operated!

