Losing a fish sucks, but losing a fish you have had for awhile and not knowing what caused the death, sucks worse. A Royal Gamma I have had for about 2 years was stuck on the grill of the overflow this morning. And I had no warning. I changed the tank that she was living in, well over a month ago. All the other inhabitants are fine. And I would have thought that deaths from the changeover would have occurred before now.