Hey there, how exactly have the fish looked when they died, was the entire body gold including the fin, which has decoloured? Are there any other physical changes in the fish? Have you added anything new recently?
When did you last do a water change, how big is the tank, how many fish, what filters and foods do you use?
I do have a fair amount of knowledge, so lets see if we can figure out whats happening.
Do you have a good fish shop near you? A test kit that will measure ammonia, nitrite, nitrate and pH is what you need.
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