Offer some plants to the tank, and give the fry some spots to hide. My cories have successfully bred and raised my number from 3 survivors to 9 in the last few months. (BTW, I've done nothing to save them. They just take their chances. Some make it, probably many more get munched as eggs and maybe others as fry.) ;-) They just need to be able to hide. They will find food on the plants - microorganisms, etc.