Fish Diseases: Treatments

While several diseases were mentioned last time, there are also many causes of death in fish that have nothing to do with bacteria, parasites, or fungi. Overcrowding is the cause for Carbon Dioxide Poisoning, and that can be prevented by making sure that the aquarium contains only 2 inches (without fins) of fish, per gallon. Fish will remain at the surface of the water before they die.


Live plants that have died and are decomposing will sully the water and cause fish to die. It is good to make a habit of observing your tank, and paying close attention to everything that is inhabiting the tank. When plants begin to decay the air around the tank , or room tank is in, may begin to smell acrid.

Bug sprays, scented sprays, perfume, ect. have killed millions of fish. Never spray these products in the room that contains the aquarium. Objects in the tank that have been washed with soap and water can also kill your fish if they are not rinsed out properly before being replaced. Hands should always be washed after using poisons, and it should be made a practice to wash hands even if you haven’t handled such products.

Listed below are a few drugs, and other treatments that can be used for the diseases, bacteria, and fungi that were mentioned in the last article. Most of these chemicals, drugs, or dyes are easy to acquire at your local pet shop or super center. Some might even be found in your own home.

Always remember to read labels before purchasing items. Some products say they will cure a disease, but may not have the proper ingredients to do so. Also, compare prices as this can get very costly.

While most of these come in bottles with droppers and easy to follow instructions, I have included the old time stock solution recipes, and these are the few.

Acriflavin: Make stock solution of 1 grain to 8 ounces of water. Add 1 tablespoon to 5 gallons of water. Water change is not needed unless fish begin to swim only at the surface. Treats Saprolegnia, Velvet

Copper Sponge: Place non-medicated copper sponge in aquarium. If the fish begin to receive too much copper, they will keep to the surface of the water. Remove the sponge, and perform a partial water change. Add 12 pennies per gallon of water to treat Velvet.

Formalin: 8 drops per quart of water