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How do I treat Fin Rot or Tail Rot? – Water Garden Q & A

Picture of Tail Rot

Q: My mother-in-law has a water garden in her yard. One of her gold fish now has no rear fin. It looks like he had gotten stuck between some rocks or something had gotten a hold of it. The fish is now laying in the rocks, but having a hard time swimming. What do I do? -Faith of Granite Falls, NC

A: When a fish begins to lose their fins or tail, it is usually referred to as “fin rot” which is a bacterial infection. This can happen for many reasons such as stress, poor water quality and/or an over population of fish. Any one of these can all cause a fish’s immune system to become weak making it vulnerable to bacterial infections.

If your fish already shows signs of “fin rot”, the following is recommended: Melafix , Pond Salt and Anti-Bacterial Fish Food. This will treat both externally and internally. Depending on the size of your pond and your ability to isolate sick fish you can choose to treat your entire pond or set up a treatment tank.

Good Fish Keeping Tips to Prevent Diseases:

1.) Use Pond Salt to lower stress. Adding pond salt to your pond will lower stress as well as treat for almost 80% of the common fish diseases.

2.) Maintain good water quality! This can be accomplished by having an adequate filtration system, reducing fish population, less frequent feedings (and use high quality fish food) and by adding natural bacteria such as the DefensePAC to reduce excess nutrients.

3.) DO A SPRING CLEAN OUT!!! Empty the water out if possible, power wash and remove bottom sludge and algae. Oxy-Lift can be a great tool when doing a clean out or performing regular maintenance.

4.) Perform regular water changes. You should do a 10-25% water change every 1-2 weeks. When doing water changes it is always recommended to use Water Conditioner to remove and detoxify chloramines and heavy metals.

5.) Add floating plants such as Water Lettuce and Water Hyacinth to reduce excess nutrients.

Melafix Dosage rate:
You will need ¼ cupful (60 ml) for every 600 U.S. gallons (2,280 L) of pond water. Repeat dose daily for seven days. Results can be seen is as little as four days.

Dosage rate for Pond Salt when treating for disease:
Use 5 cups of salt per 100 gallons – Note at this rate you will have to remove pond plants from the treated pond. If removing plant is not possible, isolate the sick fish into another tank with vigorous aeration.

Dosage rate for Pond Salt to prevent diseases:
1-1/4 cups per 100 gallons (for ponds with plants) and 2-1/2 cups per 100 gallons for ponds without plants.

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