Fish Dieing

[This Old Spouse]

Since you're cycling your filter with fish already in your tank, you're now in what we call a "fish-in cycle" and you'll need to do daily water changes.

Here's the thing. Since you'll want to keep close tabs on your water parameters you should get yourself a liquid test kit such as API Master Freshwater Test Kit or Nutrafin or Salifert. They're all good. You should test your water daily for Ammonia, Nitrite and Nitrate. When the first two are 0 for a couple of consecutive days and you start getting readings for nitrate, you've cycled your tank and can drop down to weekly water changes.

 

[gonzogonzo]

my tank is good and my fish are ok ,but why are my sliver dollers only come out when the light goes off??