Found fish dead with mouth open. What caused this?

  • We are currently upgrading MFK. thanks! -neo
Like i said b4 he said the fish was fine this morn and it was eatin but dead when he got home. The tank has a filter and air pump so lack of oxygen doesnt sound right.
 
any ideas on what made the fish die. these are what i thinked caused it.

1) stress caused by gt that led to death
2) choked on stone
3) NO CLUE
 
I had a pike cichlid do the same thing after a 6 hour long power outage. Any chance of a lengthy power outage stopping the airation and filtration?

The water would test "normal" for ammonia, nitrites & nitrates after the power came back!
 
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