Did you witness it being harrassed by any of the other fish?
nope, all he did was live under the live rocks making his tunnels
Do you have anything in that room that would startle the fish?
it is a quiet meditation room with nothing but fishtanks, pillows and books.
Do you have a general idea when this occured?
middle of the night
Did it happen soon after lights on or lights off?
sometime after lights off
What are you water readings soon after this event?
they have been stabilized for a week
The only new event was the dripping of the limewater, and that was done so minutely in comparison to the size of the tank. As I had never done this before, I only hung 1 quart to drip, I used 1/4 tsp of lime to the quart.