the weirdest fish deaths i experienced was when my two pacus were playing and splashing water in my new 250 gal ..the water that spilled caused a short and then a fire under the tank.. the fire on bottom of tank inside the cabinet caused the entire tank to explode......... we tried to save the pacu stuggling through all the glass and smoke but they died after we put them into another pond... they just couldn't recover.. the little african that was with them survived.. and went on to live another 6 yrs.. very sad night in my life losing my favorite fish this way..