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    Common Diseases Among Bettas

    Although there are many diseases a betta fish can acquire, the following conditions are the ones a pet owner will most likely ever have to deal with.

    Siamese fighting fish

    Fin Rot

    Fin rot is a bacterial infection of the fins that virtually eats away at them. It’s typically brought on by poor water conditions that stress the fish and lower its immune system’s ability to fight disease. If left untreated the infection will work its way into the betta’s body and eventually kill him.

    Treatment consists of a complete water change and medicating the fish with tetracycline for the initial bacterial infection and anti-fungal medication to stave off an opportunistic secondary infection. […]


    Constipation is the result of over feeding your betta. Signs of constipation include a lack of appetite, swollen abdomen and an absence of feces in the bottom of the tank.

    Treatment often involves fasting the betta for a day or two. Another remedy is to feed the fish a single frozen pea with the skin removed. The fiber helps move the blockage. Remove any uneaten pea after 20 minutes.


    Ick is a parasitic infection, and these organisms are almost always present and waiting for an opportunity to latch onto a host. The first sign is a few white spots on a betta’s scales that look like tiny cotton balls. These are actually cysts that harbor the immature stage of the parasites, known as tomites. The fish will also clamp his fins and rub up against any surface in the tank as it tries to dislodge the parasites.

    Ick can only be treated in the free swimming stage, so you need to remove your carbon filter, add an ick treatment such as malachite green to the water and raise the tank temperature to 85 degrees Fahrenheit. This encourages the cysts to detach and burst. This in turn releases the tomites, and then the medication in the water can kill them.


    This is another parasitic infection. An affected betta will have a gray to golden coating on his body. Sometimes this isn’t easy to see, but velvet should show up under good lighting.

    Fungal Infections

    Fungal infections can take hold any time there is damage to a betta’s slime coat. An affected fish looks as though it’s wearing cotton.

    Treament involves adding a fungicide to the tank. You may also need to spot treat the fish with methylene blue or gentian violet.

    Swim Bladder Disease

    Swim bladder disease affects your betta’s ability to swim normally. You may notice he has trouble maintaining his balance and swims on one side, upside down or perhaps has difficulty swimming to the top or the bottom of the tank. The problem is usually due to a bacterial infection often brought on by poor water quality, but injuries sustained during transportation, breeding or fighting can also produce this condition.

    Treatment involves moving the affected betta to a shallow tank where the water line will only be a few inches above his top fin. Treat the water with an antibiotic and make daily water changes until the fish recovers.

    Tips for Treating Diseases

    You can improve your pet’s chance of recovery if you follow these tips.

    – Choose the appropriate medication for the disease. Your local aquarium shop will carry medications for a wide variety of diseases, so ask for help in choosing the right one. True hobbyists at these shops are happy to try to help you figure out which disease your fish has and recommend the right medication.

    – Follow the directions on the medication’s label to the letter. Don’t guess at measurements; medications say specifically how much to use either per gallon or per tank size. You may need to cut down the dosage to the appropriate amount for a smaller tank. Keep in mind that some medications will kill a fish if they aren’t administered correctly.

    – Follow through with the treatment as recommended. The biggest mistake most people make is to discontinue the medication once the betta begins to improve. This often allows the disease to regain a foothold, and then it will usually become resistant to the medication once treatment is resumed.

    The most important tip of all involves prevention. A betta will most likely never suffer from one of these diseases if his tank is kept clean. So, carry out those routine water changes, change your tank filter as recommended by the manufacturer, and really take the time to observe your fish so you can spot any sign of illness at the onset. Treatments are always more successful when you catch the problem early.


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