Dodgefreak and myself have had a very similar experience with this type of death. We have a theory that we'll be working on (posting) in the near future so fellow MFKers may possibly avoid this situation.
I don't wish this on anyone....it really sucks to watch a beloved fish die.
I hope it can not pass to humans... cuase if you pass it to me when I see you next weekend... I will be super pissed...
seriously sorry... I came home from out of town Wednesday to a dead lab (not dog) and all my fish laying at the bottom... The power went out for 12 hours... and I had no clue...