How to Help A Sick Fish

“Help! I have a sick fish. What do I do?” is the most common question we get asked. Regardless of the issue, there are some things you should always do:

  1. Check your water chemistry. Low cost, reliable, at home test kits should be included in every new aquarium and pond setup. Make sure you use yours regularly and know how to properly read all the results. In a pinch, many pet fish stores offer free or low cost testing. Many issues that cause sick fish can be related to water quality. At the first sign of illness, test your water quality!
  2. Look at your fishes’ diet. Just like the food we eat affects our overall health, so does your fishes’ food. Most fish foods will start to lose their vitamin content after only 90 days! Flake foods will lose their vitamins faster due to increased surface to mass ratio. If you have some questions about what diet is best for your fish, ask your local fish veterinarian or pet fish store for recommendations.
  3. Check your other fish for signs of disease. There may be one susceptible fish in your tank or several. The number of fish affected will help indicate what illness you are dealing with.
  4. When was the last time you added new fish? Adding a new fish that was under considerable stress from transport and then dropped in an alien environment can bring lots of fun parasites and diseases into an established tank. Just like you bring home lots of new germs from the airplane ride with complete strangers, so does your new fish addition.
  5. Call a professional for assistance. Do not waste time falling into an internet black hole. Many seasoned fish hobbyists can help with general husbandry and diet issues. For disease diagnosis and treatment, you will need to contact your local fish veterinarian. We realize that there are currently many over-the-counter medications available, but keep in mind that these are not regulated products. No one is checking the contents of those little foil packets before you dump it in your tank/pond. Treating a fish that does not need medication can breed resistant strains of bacteria that can affect your fishes’ future health. For a list of veterinarians who see fish, check out the American Association of Fish Veterinarians and the World Aquatic Veterinary Medical Association.

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