My corydoras spawned about 2 weeks ago, maybe a bit less. All the eggs I could see hatched without a problem and I would see fry everynow and then. Just yesterday I started to see fry coming out of the woods and start foraging like corydoras which I thought was a good sign. I just watched 2 of them die. It is pretty weird. They would swim along the glass and then randomly pass out and fall to the ground. Any ideas as to what caused it? Were they simply not fit enough?