I just had to share this. I thought it was funny. I was watching a repeat of a show called sea patrol and this chick has a sick fish. She had a salt water fish in a giant vase/bowl thing. It was way too big for the tank. She takes it into a LFS
and says it's sick. They guy says, 'has it been off it's food?' and she says, 'yes and I cleaned the filter with bleach the other day.' So he then says, 'well that will do it! That would make the pH drop.' He then gave her a packet of conditioning salts and says, 'this will fix it.'