Generally, eggs hatch fairly quickly, don't they? They were there for about 48 hours? Is that long enough for any to have hatched? This is a shot in the dark from an optimist...

The fact that none went white bodes well for them all being fertilized (a feat rare enough in and of itself!) so whoever did the deed did a good job. Keep an eye out for small moving objects (and keep the camera handy) and avoid vaccing the substrate for a bit just in case...
You could also try to take some time daily to observe looking for gravid cories or other fattening fish to see if you can identify any possible pairs.

You sure did bring a little excitement to this place.
Thanks for sharing!
