I have no idea why my ghost shrimp keep biting the dust. I have been doing normal water changes 1 once a week, i only lightly dose with khso4 and some microferts. But every time i add more shrimp they last 1-3days max and i come in and they are solid white and dead. What can be causing this? I had shrimp for a year or so and it’s just recently this has happened. I also dose the liquid co2 stuff but have cut that way down to once or twice a week at 5ml for my 60gal. Any light on this matter?

Thanks