heidigirl99

Hi all, 
 
someone please help identify what these patches on my corydoras look like. They were in a 10g tank with a betta that just died with symptoms of dropsy. 
 
Because I only had one cycled QT, I moved these 4 to my 20g fry tank, only later to realize that they had these lesions. I’ve done 2 water changes and increased the temp of the fry tank but otherwise I am at a loss. I’m so afraid this is something contagious that will kill all my babies 😞