I bought some Tetramin 14 day holiday food for my fish at the weekend. I put it in yesterday at 5.30 and went to bed at 10.00, all was fine. I was woken up by my dad, who turns on the tank light when he goes to work at 6. He told me that the water was all coudly and that most of my fish were dead. I raced downstairs to find 5 of my 6 tetras dead and my male guppy not looking to good. I did a 50% water change immideatly but had to leave for work. I asked my dad to let me know how they were when he got home, thankfully my tetra and guppy are still alive. But I want to warn people about this product. I am going back to the pet store tonight where i got it from and reccomment they take it off the shelves. I also emailed a complaint to the company Terta about this but am still waiting for a reply. So be aware about this product, i dont want what happened to me to happen to anyone else.