I haven't bred cories yet which is kinda why I wanted to try my hand at it. I've bred a number of different egg layers other than the ancistrus (pretty easy), some more tricky than others.
Rosy Barbs (medium tricky--they like to eat their eggs)
Angels (easy to breed, getting the babies through the first two weeks is the hard part)
White Clouds (pretty easy peasy)
Kribs (a little tricky)
Apisto's (pretty tricky)
tricky levels are just my opinions. If I got frustrated, a higher trickiness level is assigned!
regards
mike