What is harmful to fish?

  • We are currently upgrading MFK. thanks! -neo
Chlorine and Bleach are the big ones for me.. that stuff does nothing but kill living things. i don't even allow it in my home.
 
Any type of sprays around the tank.
 
Any type of sprays around the tank.

We are talking what kills/affects fish in nature.
 
Acid rain!, caused by (30+ years since I was at school so the chemistry may be off) sulphur comopounds in industrial waste/smoke turning rainwater to mild sulphuric acid. Caused huge areas of forest and lakes and everything in them to turn to dead zones.
 
Thank you all. I think i have enough topics to study. I knew i could trust MFK!
 
MonsterFishKeepers.com