My kuhli loaches are always spawning, in the tops of a fine leafed stem plant (rotala i think) but i have once seen the eggs (when every other fish was eating them) and have never seen fry. They must spawn over night because they are normally at the top of the tank before i go to bead, and the females get very ripe with green eggs. I have plans to one day set up a small, heavly planted tank to have a good shot at spawning these guys.
HTH