There are lot of good medicines available to treat sick fish.
The problem however is properly diagnosing what is wrong and then choosing the right treatment.
Is the fish worth the investment of time and medicine?
You must act decisively especially if there are other fish in the aquarium.
There are many combinations of data needed to make decisions on treatment.
If there is an emotional attachment – and the fish is a pet – then you should already own a good book on aquarium fish keeping.
If you wish to become an expert in all related husbandry aspects of the aquarium hobby then add a book to your library that is specifically about diagnosing and treating aquarium fish diseases. In fact a small library of aquarium books will be necessary.
An ounce of prevention is worth a pound of cure.
Knowing beforehand what your fish needs to remain healthy is the most important line of defense.
The literature does a more than adequate job of providing the necessary information and guidance.
