Here's the deal, I got a 10 G tank and killed a bunch of fish. Now it's "stable". Ph 7, Ammo .50ppm, nitrIte 0ppm, nitrAte 0ppm, and still a small Angel died today!?!?!? I went thru several water changes etc to get it there. Now here's where I'm at. I bought a used 55g tank with everything...