I lost Saphire friday

.... I was doing a water change when I realized that I had now am-quel, so I had to use a substitute,and this was sunday. from then on, she did little moving, until thursday when she seemed almost normal, but I added he am-quel anyways (i brought it home from school. I had forgotten about it). next day, she was dead. I didn't know you could put too much am-quel and actually hurt the fish..... (I dumped in a whole capful

) I should have done a water change instead

....