Discus are sensitive fish and need warm, stable water. You need to be able to keep the tank at 83* and keep the pH constant. A little high all the time is way better than 7, then 7.8, then 7.4 and so on. I've been told they're very susceptable to disease too.
this is just some general info I've gathered from the forums. I wish I could remember the site, but there is a forum dedicated to discus care. You should look it up and read...a lot. I too want to keep these fish eventually. Just rememer, they're very unforgiving and can die on you in a hurry.
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