Only just saw this thread. Firstly, congrats on spawning the oto's. Although apparently hard to do, it is the easy part. Raising the fry is difficult and they seem to need everything to be perfect in order to survive.
If you click on my sig at the bottom, I have a thread where we were able to spawn and raise fry. Hope you find some useful info.
I saw a 5 strong group of our oto's spawning last night. Unfortunately our SAE's were following closely, so any eggs are probably last nights dinner.
Good luck
Carmen