At the moment my Ruby Clown (Bolivian Ram) is about to croak. I am not sure what to do to prevent this or is it inevitable at this point. My fish has red gills, is breathing hard, is having difficult staying upright, is having difficulty swimming and it is just a matter of time. I just bought an airstone, but up to this point (10 months) have not needed one. Also water params are good and just did a water change (50%) about 2 hours ago. Also about a week ago one of my gouramis suddenly died. Should I quarantine this fish?