I'm afraid my poor Danio - boy (or girl) is starting to show signs of it's end of life.
I've been treating the tank with Melafix over the past few weeks and last evening, I topped the tank off with some distilled water and added more aquarium salts.
I came home tonight from work and it appeared lifeless in the tank.
After tapping the glass, it started to swim around again however; it looks very distressed. So I added 2 more teaspoons of Melafix, slow downed the filter and cranked up the heater a notch.
Keeping a watchful eye on the poor little guy.
I bought this fish in 2000! It's 13 years old!