Arkin said:
They also like to use the water conditioner, although they still insist it isnt necessary (although you may prefer it) if the water change is less than 20%.
Show me the link to the page and the line that makes you think this because in one of the *********** shows, I heard them specifically say that they have found that their fish do well with a little chlorine in their water. And I have also heard during one of theirs shows, a person call in, and they told that person to not add any water conditioner and they never pointed out that they might prefer it in there nonetheless. In the contrary they have said they do best this untreated way.
And rbishop, the guys that say this info are the bailey brothers, you can go to their show at www.***********.com, after listening to a couple of show you'll learn that they do not advertise anything or try to sell you their product, they just recommend products, just like people here recommend products.
About that page though, reread it, it's not that difficult to understand, for fish bowls don't put water straight from tap if you change 20 percent of the water, for aquariums or ponds, it's fine.
In the site they recommend a water conditioner, but that's only to use if you are replacing more than 20 percent of the water, which they dont' recommend because it stresses out the fish too much to change more than that amount of water at one time. And when you are setting up your new aquarium and newly filling it with water.