I'm going to monitor the water temp throughout the day. Another hypothesis of mine is the cory's eaten petals from the Ornamental Pear Tree that fell in, and it poisoned them. I think this is a long shot, but what do you guys think?
What I did was I acclimated them throughout the day. I put them in a bucket and spooned water in their every half hour. The Rosy Barbs were already in an outdoor pond. So I thought they would be fine. Exactly how am I supposed to do what you are suggesting??
You think they can go with a Delhezi Bichir?