I'm not sure what happened...the new platy I got died today. She was kind of hanging around near the top a lot and I'd begun to notice that she seemed almost afraid of the other fish, yet they weren't bothering her. I was about to log on when I noticed her floating oddly and she'd died. Could this have been stress or what? I'm further worried because the male spends a LOT of time near the bubbles that are immediately near the airstone flow I have. Almost obsessive. I mean, could he be having trouble breathing? None of the other fish (the remaining female platy and the corydoras cats) do this.