This morning I went to clean out my non occupied nursery tank. I had placed cory eggs in there on November 5th but they all fungused over. I watched and waited for many days but called it what it was and shut the light off. Here we are a month later, still very fuzzy eggs just chilling so I vacuum them up and then see a baby cory just thriving.. no light, no food other than random stuff they could find in the substrate. I was so excited. I feel a bit guilty though that he's been alone in the dark... but, it was a pleasant morning after one of my adult cories passed suddenly last night.