Hi BOD
Good for your corys!
If you want to save them you will need to move them into a tank by themselves before they are all eaten. They will also need good water circulation around them to prevent fungus.
If it's too late to save this batch, don't worry too much. If this was their first spawn, chances are they will do it again in a few weeks, and it will be a bigger spawn too. By then you can set up a breeding tank for them.
If you would like to give it a try, I'll be happy to help you.
