As I was on a trip in NYC, my dad called and told me: " The water got a bit too hot so I decided I'd do a little water change on the tank."
Then I didn't know what to say... " Did you at least put salt in that water you added to the tank?"
Dad: " Oh no, I completly forgot about it!
I had 6 BTA bleached and a huge frogaspawh died when I reteurned home. It could have been worse