I heard one of the bala sharks in my aquarium chomping away on something and when I went to have a look, was startled to find that something had laid clusters of eggs overnight.

Further research pointed to the cory cats as the likely source of the eggs, and sure enough, I saw one of the fish laying more eggs. I cut off one leaf that had eggs stuck to it and put it into my isolation tank; as for the others I can only hope that a few will survive the incessant foraging of my bala sharks. If enough hatch and survive I may use the new fish to re-stock my office aquarium, where my attempt to kill off snails using copper unfortunately killed off two of the four panda corys.