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I think ph and temp must be close to the same before you can just dump them in. If not then I would bag em and acclimatize them like u would if you got them from pet store.
i wuld do what bbush said. put them in a bag and acclimate them slowly to a clean cycled tank.
if you really want to put the nasty water in I would only add half or a quarter of the nasty water and the rest clean treated, temp matched water.
I put them in a 10gallon with an extra seeded sponge I had. I was a little wary given their conditions. Anyway looks like two of them have white spots on their fins. I have some Maricyn that I'll start giving them. Not sure. The pleco didn't make it :/