I was very frustrated after having multiple pests in the tank. Red bugs kept showing up on purchased or traded corals. Decided to take my corals out of the tank to run interceptor in a tub overnight. Well, I guess I wasn't thinking clearly due to frustration, but I put a cover on the tub. Heater inside ran to heat water, but with lid on all heat was trapped. In the morning the house had a very bad smell. Saw the lid on tub, and knew immediately what happened. Tank full of corals bleached/cooked in the process. Tank went into further decline, in part due to change of equilibrium and in large part because I was pretty down about the "event". Been years, and just getting tank back in shape now to accept new reef life.
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