I wonder if we could find out what the active ingredients for Amquel II and Stress Coat are. If they are the same, using them both is redundent. On the other hand (or is that fin?), different chemicals can be used to reach similar goals.

You have quite a bit of company among those who feel that an established aquarium will take a certain amount of chloramine and "use it up." It seems that Python water changers are almost a requirement for "cichlididiots" (their term not mine) since they use such big tanks and often need such massive water changes. Certainly the hobby would be different without them (both the pythons and cichlid enthusiasts).

By the way, for the thrifty minded, one can put together a less expensive device with just a clean garden hose (drinking quality means you don't have to worry about plasticisers washing out, though one could just let it rinse out before use) and one of those water bed changers. I think the python would last a lot longer than the water bed devices however.