jay733 said:
What kind of complecations? And no I dont' mean with high dose of chlorine in the tank, I mean with the amount of chlorine you would normally bring to the tank when you do 20 percent water change. I don't want to explain myself again with high chlorine levels.
And as you notice you say scientific 'observations' so they are observing the fish as well, so how scientific are your eyes? Just as scientific are the eyes of the Bailey brothers that say they do better with untreated water from their observations.
And furthermore, observing bad health in tank can be signals of other factors, health, food, handling, other aggressive fish, all can change the health of a fish and this can easily be mistaken by the scientists to be because of cholorine in the water. So in the end they are really not that scientific, they give you stats on the amount that is bad for your fish's health, but they base the fish's health on their 'observations' just like my source does but with different conclusions apparently.
When proving a theory in science, you have only one variable at a time. A process of elimination, if you will. It's a controlled test. These guys don't just throw 10 random fish into a tank, feed them random amounts of food, and do random water changes / maintenance. Not to mention, you can tell if a chemical is causing problems due to tracing it through the fish's blood stream. See if it's causing any changes to natural body functions and so forth.
Here's what I think you're picturing Jay. 2 guys in lab coats, with a 20 gal tank and 5 semi-aggressive / community fish in it. Lost of pretty flowers and decor and such. Doing 20% wc's one week, 50% wc's another. Feeding them un-measured amounts of food (what they think the fish can eat in 2-3 minutes). And saying "aha!, The fish are dying and it's GOT TO BE the chlorine."
There is only one factor tested. A single fish, in a controlled environment, with the measured reccomended amount of food dosage given at specific intervals, with un-conditioned (chlorine contaminated water). Either set specifically just above the maximum amount, or right at it. And seeing how the fish does. They repeat this process with multiple fish, to eliminate any defects in the fish chosen.
This leaves no error in fish aggression, overall health of said fish, over feeding / underfeeding, or any other variable that might contaminate the end results.
Like I said, it's a "process of elimination" way to go about it. Everything is controlled to be in specifics.
I'm being fairly vague as I have never tried to test anything with fish, as I'm no scientist, but I do understand the basics of testing a theory. I did my share of science fair projects lol.