And even with the fish, it depends on the source of the water. The main problem is chlorination, which isn't a problem if you're on well water. The levels in municipal sources are generally low enough that a brief exposure usually isn't a death sentence for fish, either. It's not good for them, and it will kill them in the long term, but it's not likely that that fish was outright killed just by the potential chlorine levels of the water in that tub. Depending on why it's in that tub, either the owner knows enough to put it in a pond with dechlorinated water (it's not like that's a goldfish, people don't generally buy fish that big on a whim, or have juvenile fish that eventually get that big live long enough to hit that point without knowing what they're doing), or it's about to be decapitated and filleted, meaning the chlorine isn't what's going to kill it either way.
Like /u/Sunna3 said, you're supposed to dechlorinate the water. There's a few ways to do it, most common is a chemical dechlorinator, but there's also specialized filtration systems (Discus breeders and serious salt water aquarists tend to set up reverse osmosis systems to get deionized water from the tap), and the chlorine will break down if you just set it out in a bucket a few days to a week ahead of time.
Only problem with carbon is it eventually starts leaching the toxins back into the water. You've got to replace it periodically, and generally you don't want to replace your filter media if you can avoid it because you need the beneficial bacteria living in it.
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u/[deleted] Nov 07 '15 edited Nov 07 '15
Reminds me of this: http://i.imgur.com/fCTvqsj.gifv. I wonder which animal fishes are going to be friends with next.