03-05-2007, 12:44 PM
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it's alot like "aging" water. I keep freshwater discus, and alot of people that keep discus will age their water for awhile before they actually use it in their tanks. like he said, keep it covered, keep it circulated, it's better for the fish that way, blows off CO2 that is naturally in tap water, allows chlorine to evaporate with out additives (but not chloramines) and it's also useful if you use RO water. those systems usually don't pump out water fast enough, so people just store it in barrels or what not. make it every once in awhile in big quantities, instead of little bit each time for every water change.
but, most of my experience is with freshwater, we do alot more water changes. especially with discus. have fun!