Ugh, I feel like a horrible person...I did something EXTREMELY stupid about a week ago and just need to get it off my chest. Before leaving on a trip, I tossed a *miniscule* piece of peppermint bark chocolate into my hobby tank when feeding, wondering how the fish would react. I checked the water and couldn't find the piece, but it was so tiny that I doubted it would hurt. When I returned from my trip, I came to a breeder box full of dead fry! The piece of peppermint bark had fallen into there, and many of the fry had gorged on it and killed themselves. As I took the dead fry out, I didn't realize that the bark was still there until it sunk to the bottom of the main tank. In a second, a few fish gulped it up. Since they were adults and the piece was so tiny, I thought nothing of it and disposed of the dead fry. Then, the next day, I came to two dead fish who had been helathy until ingesting the chocolate. I was mortified and quickly disposed of the fish. Then I cleaned out the area and checked on the other fish. All were fine. So I lost most of my fry and two of my hobby fish just because of my STUPID, STUPID, mistake. I am extremely embarrassed and annoyed with myself. I can't believe I was so careless and have no idea what possessed me to throw the bark in the tank. I just wish I had thought before I had done so...sorry for the rant, just angry at myself for killing them.