I crashed it. My wife and I went out of town for a week, and we came home to a dead tank. The fish survived. I did a quick water change before we left for the airport, and left the drain open in the sump (I have the tank plumbed to do water changes just by turning valves). Water slowly drained, and the tank toped off with freshwater for 5 days. Salinity went from 1.025 to 1.010. One of the worst days of my life!!! This was in August. I recently cleaned out the fish room and got the tank running again. It will be a fish only until we can afford LEDs. Can't afford the electric bill with MH and a 1hp chiller.