BTW----If you have a mantis species tank, I would be real careful with what the carpet cleaners put down. They are extra-sensitive to various household items.
Mantis shrimp sensitivity to various household solvents
I too have heard of people who swear that the only thing that happened the day they had problems in the tank was when they cleaned their carpets. However, I think this is probably user error. It could very well be that they weren't using a professional and they didn't know what they were doing. Or they might have been the typical American who says if 1 cup of this cleaning fluid is good on this rental cleaner, 5 cups will be five times better!!!