My wife asked me if I was going to post what happened. I told her no way, because I didn't want to look like a complete moron for what I've done. Than she said: "What if you could avoid the same thing from happening to someone else?" So, here is the story: When I moved in the summer and moved my tank to the new house, I forgot to put the heater back in the sump. The chiller was working good and the temperature was in check. Even after the summer was gone, we kept the house aways nice and warm for the dog. Temperature was always good. Then, it was time for a vacation. I checked the parameters. Everything was spot on. Since the dog was going to stay at my parent's house, we turned the heater off and left. It didn't even cross my mind that the tank was without an aquarium heater. On the next day, my mother went to my house to feed my fishes and corals, only to find everything dead. The house thermostat was showing 50 degrees and my friends froze to death. On the top of the pain of loosing the animals that I loved so much, I need to deal with the reality that I killed them by not doing a proper pre-vacation check of my thank. What a moron!!!