PlanetCatfish.com

Yes, I only bought plants once back in December. First six fry showed up in early Jan, second six in early Feb, and I just noticed a single new fry on 22 Feb. It appears to be 10-14 days old. Plants would also explain the fry turning up in three different tanks.
All the tetra fry are in their own 40 gal and the C. sterbai fry are all in another 40 with their parents. Yesterday I placed a trio of Otocinclus in one 10 gallon and six C adolfoi in the other 10 gallon as those are my next spawning projects. We'll see if any more tetra fry appear.
Cold temperatures could be the factor. The tanks were hit with large cool rainwater changes several times in an attempt to get the C. sterbai spawning.
-Shane

Well C. adolfoi did not prove a challenge. Transferred out 9 eggs today. Dropped another half dozen in the tank trying to remove them. I am really bad at harvesting Corydoras eggs. Added a yarn spawning mop to make things easier in the future. Incubating the eggs in the tank with the tetra fry.
-Shane

Congratulations. If the eggs are on glass, the easiest thing to do is a partial water change - lower the water level below the eggs and scrape them off with a razor blade. You can also do this under water, but if the eggs are old enough to have lost their fresh stickiness, then they'll just sink to the bottom as you loosen them with the razor.

Good luck,
Eric

I'll give that a try. Great idea Eric.
-Shane