Well I have a peculiar situation in my tank. In consecutive days I have awoke to find a dead tetra. The fist day it was a lemon tetra I had for months. The second day it was a neon tetra. Both fish had been eating well with all the others and displayed no signs of sickness. Each morning after finding the fish I did quick water parameter checks and found that ammonia was 0, nitrite was 0, and the temperature had not fluctuated even a degree. I cannot figure out for the life of me what has happened and I fear waking in the morning. I take EXTREMELY good care of the aquarium and have never had fish death before. Can this happen? Can fish just die? I am really sad and it has made me fear a complete tank disaster. I was just hoping maybe someone would read this and have a similiar story or some advice to share. I bought replacements for the schools. Probably not a good idea I know but I humanize fish too much and felt they missed there friends. Anyway, even if you just took the time to read this I appreciate it. Thanks.