worst night of my life

[deep_six]

I feel for you!
Believe it or not I had a similar experiance a couple weeks ago. I put a second heater into my sump to better regulate temp. and not even an hour later it completely exploded. The side of my sump was gone and there was water all over my office entrance. Luckily there was not a lot of damage to the main tank and most of the fish and corals survived. Although my toadstool leather did close up for about a week after.
Everything seems back to normal now.