Internal Parasites – Discus Worm, What are the Symptoms and How to treat it?

Symptoms of internal parasites in Discus: a) not eating b) not growing c) dull color

Why discus fish refuse to eat?
Healthy discus fish eat anything you give, when they are hungry. If they do not eat, there must be something wrong the fish and not the food. They have no appetite to eat because of internal parasites – WORM

Why discus fish eat but they do not grow?
All the nutrition intended for the discus is taken up by the worms. Discus free from worms will turn the food into nutrition for them to grow.

Color of discus fish look very dull
The color of the discus does not look attractive. Even when using natural enhancer, it does not show improvement as all the vitamins and nutrition is taken by the worms.

Discus should be treated for worms. We must de worm them once every month. Especially if they are fed live food, tubifex worm and bloodworm, as these do bring internal parasite to the discus. Treat them and get rid of worms every month. Your discus will eat, grow and they will look attractive.

Types of Internal Parasites
Hexamita, Roundworms, Capillaria, Threadworms Tape Worm, Metacercaria, Sanguinicola

For the treatment of flagellates (most common ailment of discus):
When you see white feces (white excrement) are present in the tank, and the fish will not eat then use:

  • Metronidazole B.P. Tablets – 200mg
  • Dosage: 2 tablets for 50 gallons water

Change water and repeat the treatment everyday for 5 days. When white feces disappeared and see black feces, internal parasites cleared.
Metronidazole B.P. Tablets Ð 200mg

Comments (16)

  • ayan shroff

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    my discuss fish is not eating for two weeks. and white feces come from fish. used metronidazole for last 10 days every day. but no result. change water 25% every days. and treat metronidazole but no effect.use salt too every day.what other medication i have to give.thanks for your help.

    ayan

    Reply

    • allan

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      What food are you feeding them with, Dry or live food?

      Reply

  • Michele

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    Hi, I have just done a 30% water change and noticed some thin, red, 1″ long worms in the water. I feed my Discus with dry, frozen bloodworm and beaf heart. Should I worry about these worms?

    Reply

    • allan

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      Reply:
      Put some rock salt
      Need not worry

      Reply

  • Michele

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    Many thanks Allan !

    Reply

  • ashok

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    HI,
    I am purely hobbyist, and my discus eggs hatched many number of times and i could see the wrigglers. But the fries are scattered everywhere in the bare bottom tank alongwith food debris, so it is dying before free swimming (after second day of hatching). Even I could see a small minute worms just like pin needle tip size (eating the wrigglers), what I have to do please tell me, I have very beautiful blood red malbaro and yellow sunrise laid nearly 10 times but dying. It is a breeding tank, 2x2x2ft, temp 30c, bare bottom, only air stone, no filter, feeding tetrabits/hicari discus bio gold, dry worms and goat heart and other rich foods like greens, walll nuts and many more.

    also please note, the water are clean but the bare bottom with scattered wriggles and fish debris difficult to do water changes. any tips and tricks will highly be appreciated.

    thanks
    ash

    Reply

    • allan

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      If your tank has worms then it is hard to succeed in breeding and caring for the fry. I suggest the first checklist is to maintain a clean tank. We use bare tank for breeding as it is easy to change water. We feed them before changing water daily so that uneaten food can be siphon out and does not decay, promote worms or bacteria that will harm the fry. Even though you will siphon some of the fries when changing water, it is still better that to have the whole tank infected and lose all of the fries.
      To make it easy for the fries to stay close their parents, you can reduce the water level, restricting the distance from top to bottom, so that the fries are not far away from swimming to their parents. Keep trying and you will succeed soon.

      Reply

  • amjad

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    i have two leopards 3 inch. now i feel like they are refuse to have the food i feed them beefg heart mix. and i dont have a idea to how to see the white face how should i treat them pls

    Reply

    • allan

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      not white face … if you see them shit white stuff then they have worms. normal shit is black …

      Reply

  • Harry

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    Hi i am Harry..mr Allan can u please help me..i am having breeding pair of discuss fish ..but the problem is that they lay eggs and hatch the fries too.but the fries dont comes on the body of the parents..i suppose this is having since last 7 times…one more thing i want to ask about the white shit stuff.my fishes are not eating anything and i can see all the white shit in the tank.i have treated them with metrogyl 400mg 2 tablets daily with 75% of water change since last 8 days but still nochange in them ..still not eating…

    Reply

    • allan

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      Fries not close to parents body
      Some strains with very clean body will have this problem. It will take the parents a few times to get it right.
      You can try to do the following:
      - if you are not using a breeding tank, use it the next time (big tank, too much space for fries to get lost)
      - lower the water level – same reason as above
      - it many times still cannot, try swapping with another male or female
      - use brine shrimp to give the fries alternate food source if they cannot get it from the parent’s body.

      Reply

  • FishLover

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    hai mr allan…love to see your website…i got a bit problem about my discus…i jus bought 1 pair discus…but i let them live with golden arowana…is that a big problem?? because the discus always hide behind the filter, seldom come out…when give them eat jus come out awhile…can say not so active…

    is that the fish cant mix live with arowana? or got other problem.

    thanks for helping me bro..thank u very much

    Reply

    • allan

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      You are right, arowana is best left on their own. If you still keep them together, you will find your discus in heaven.

      Reply

  • FishLover

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    Oh my god… Thank you very much Mr Allan… I will move them to new tank… Thanks a lot ya…

    Reply

  • Sammy

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    Hi Allan,

    If discus fish not eating for 2 weeks and they are pooping out white stringy stuff, (some are not strinky but like chunks and clear) If you use the Metro as treatment but they do not eat would their poop turn black?

    If Discus don’t eat and have no worms would they still poop out black or would it be clear since they have not eaten?

    Thank you!

    Reply

    • allan

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      If the medication is working, they will be looking for food to eat. If they still do not eat after more than 2 weeks, you will need to find out if there are other factors causing them not to eat, ie stress, sickness or water quality. Use different food to entice other than their usual food. Their poop will be black when they are free of worms.

      Reply

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