10-07-2009, 03:30 PM
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A happy, healthy betta needs a temp of 77-86F. According to planetcatfish.com, pygmy cories do best in water that is 71.6-78.8°F...I'm thinking that might make them incompatable in itself.As Byron said, these guys are fickle about water parameters. I lost 4 pygmies out of 6 myself recently. I suspect my water was too warm, too hard, pH too high, and the tank was too new. In fact, out of all the corrys I researched, only 2 fit my water parameters...Sterbai and Oiapoquensis. Most cories just like cool, soft, water.