My fish are all dying!!! The water levels are all fine... I'm a newbie. I bought a 55 Fallon tank... I ran out and bought a bunch of fish... I now know that was not the right thing to do... However they keep dying off. One or two every day. I've taken water sample in. I've teste the water... I done partial water changes... I don't k own what else to do and my daughter is heartbroken.