Alfredshouse is gone.....

[o.c.d.]

Really sad to hear.I was going to say the same thing as Fkshiu. Did you make sure that your heater isn't faulty or stray voltage. and when you measured Nitrate not Nitrite. I really not trying to insult you this is tragic but you should really be sure what caused it so it never happens again and other can be taught your hard lesson.