I need a little help and ideas. A month ago, I got my Rummies, and went through them like water. Ended up with only 4 living out of a total of 10 purchased. I still have the 4, and have not been able to get more. So I moved on to my next purchase of cardinals. I got 6, one died got another to replace it, and since Wed last week, I'm down to the last 2, and one of the two is almost dead. Two of the fishes I got developed cloudy eye/fungus over the eye. I started treatment of the entire tank with Kanaplex, and lost them anyways. The one dieing now shows no outward sign of why. Color us good, no fungus I can see. Only symptoms I see was refused food, rapid breathing, and now erratic swimming. It even stopped swimming with the other cardinal. Now here is the situation. No matter what fish I introduced to the tank, I go through this cycle of death. I'm getting so frustrated, that I'm about to pull the plug. I went through this with guppies, the Rummies, and now the Cardinals. All fish but one guppy was bought at the same location, and I keep getting "Our fish are doing fine". So I got to be missing something and need help finding it. My peramaters, stocking, etc is in my bio. The only thing not listed is my kh is 7dKH, and GH is 9dGH. This is the 29 gallon fish tank. Please help me find the solution to this never ending cycle of death. Thanks.