I've kept fish all my blummin life but this has flummoxed me.
Its just one goldfish, the filter is clean, the tank is clean, the water is ok, just added more tonic and he's well fed.
For the last 2 or 3 days he looks mis-shapen and thin.
Atm he's just floating at the top of the tank breathing slowly.
Is he doomed or can I save him?