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I have kept guppies with very good success. The only thing that can be happening is your tanks are not cycling. Also when you clean your filters if you do not keep enough nitrifying bacteria in the filter you will restart the cycle and many fish will die. When fish are stressed already and you...

I to have had issues with Red-Tailed Black Sharks. However, I think you are having some other much bigger problem. My tank, How often and how much water do you change per week? it should be around 10-15% depending on fish load. What type of filter are you using? Why is you PH so low? Do...