Help! I have lost 8 fish in two weeks. I used well water when I set up the tank, it is very soft water. There were slight ammonia readings today but no nitrites and the ph was slightly elivated. One of my angel fish died and the other was being nipped at by the other fish. He also appeared to have tail rot so I medicated the tank and put him in his own container. This morning I woke up and one of my danios looked like he had an exploded stomach. I'm by sure what's going on. I had 5 tiger barbs and I thought they were being jerks so I put them in their own little tank but I'm still having deaths? *ALL*