Goldfish Disease Medications

Here is a selection of common Goldfish disease medications grouped under the headings of the diseases they treat.  Each has an Amazon.com link for those not close to an aquarium products shop.

Alongside each medication is the parasitical, fungal or bacterial disease it can be used for.

As with any treatments, extreme care is necessary when administering to an already weakened fish.  If a fish starts to turn over on its side, the treatment is too strong.  Remove the fish from the treatment immediately and once it has fully recovered, try dosing with half the strength.

It is safer to under dose initially until the fish starts to regain some strength, then slowly increase the medication to the required strength.

Common Household Goldfish Disease Medications

Plain Un-iodized Cooking Salt (Sodium Chloride)

Plain un-iodized cooking salt can be used to treat a variety of Goldfish illnesses.Plain un-iodized cooking salt

The cheapest yet most useful medication is ordinary un-iodized cooking salt, also called rock salt.  This can be found in any food store.

Don't use table salt because iodine has been added as an additional source which our diets usually lack.

Uses: As a general tonic and boost to the immune system.  I always add a small handful of salt (about 50 mils/3 tablespoons per 50 liters/13 US gallons) at each partial water change and always add it to the water of any fish I am treating along with any other chemicals.

Goldfish are able to take high levels of salt in their water, especially if it is added gradually.


Epsom Salts (Magnesium Sulphate)

Epsom SaltsEpsom salts

Another cheap and readily available medication.  Epsom salts can be found in larger supermarkets or at the local drug store (chemist).

It looks very similar to un-iodized cooking salt and is often used as bath salts.  Bath salts often have a coloring mixed in so only use plain Epsom salts.

Uses:  Primarily used for treating Goldfish with indigestion/constipation or swim bladder disorders.


Green Peas

Green peas used to provide fiber to GoldfishGreen peas provide fiber to Goldfish

Cooked frozen green peas shelled and broken in to smaller pieces provide fiber that is lacking in most prepared foods.

Other vegetable foods that are just as effective are kale, spinach or broccoli. 

Uses:  Provides roughage for Goldfish suffering from indigestion/constipation or swim bladder disorders caused by poor food.


Fungal and Antibacterial Medications

Methylene Blue

Methylene Blue is a dye. It comes in crystal/powder or in solution. The most common form sold in aquarium shops is in solution.

Goldfish are quite tolerant of Methylene Blue and can take quite high doses, with the water almost appearing black.

It will stain everything in the aquarium blue.  The color will fade over time but to accelerate the process leave any stained items out in sunlight for a few hours.

Uses:  Treatment of fungal and bacterial diseases.  It is also very effective for stopping fungus attacking unfertilized eggs in a spawn.  Fungus will attack fertile eggs if they are close to an unfertilized egg.

Not practical for pond treatments because sunlight breaks it down very quickly.


Malachite Green

Malachite Green is a synthetic dye used to color paper and fabric. It is also useful for the treatment of fungal and protozoan infections of fish such as Ich.

Uses:  Treatment of fungal and bacterial diseases.  It is also sold as a fungicide to stop fungus attacking unfertilized eggs in a spawn but I prefer using the safer Methylene Blue.

Use Malachite green with caution as you can easily overdose your fish.

Not practical for pond treatment because sunlight quickly breaks down the dye.


API Melafix Antibacterial Medication

API MelaFix is a broad spectrum antibacterial medication that treats a variety of diseases caused by bacterial attack. It uses natural chemicals.

Melafix won't affect the biological action of the filter, alter the pH or discolor the water or aquarium accessories as some of the other treatments do.

Uses: Tail rot, fin rot, cloudy eye, fungus, helps promote healing.

Available in pond sizes.


Seachem Kanaplex Antibacterial Medication

Seachem KanaPlex works well as an antibacterial treatment.

Kanaplex is a broad spectrum antibiotic so will destroy the bacterial action of the filter.  A sick bay must be used when treating with this medication.

The manufacturers claim it will cure fungus but fungus being a genus of protozoans, I would doubt its effectiveness.

It is effective for treating bacterial diseases and is one of the few medications recommended for treating dropsy.

Uses: Tail rot, fin rot, cloudy eye, dropsy, septicemia


Parasite Medications

Microbe-Lift Anchor Worm and Lice Treatment

Microbe-Lift treats both parasitical infestations because both are caused by fresh water crustaceans.

Anchor worm are most prolific between 26-28o C (79-82o F); temperatures lower than this slows the life cycle down, and below 20o C (68o F) it stops.

Several treatments are required because the eggs are not killed.  The interval days will vary depending on temperature, 7 days being usual.

Uses:  Kills water borne fresh water parasitical crustaceans.

Available in pond sizes.


Aqua-Prazi Fluke Treatment

Aqua-Prazi is a Praziquantel based medication that kills both gill and body flukes that are a major problem for fish in crowded conditions or under 2" (52mm) in body length. They can wipe out an entire brood of fry in days.

If fish are seen twitching their fins or darting around the aquarium, it can be assumed they have flukes.  Even if you don't have a problem with flukes, it pays to treat any new fish as a precaution.

Praziquantel  is non-toxic to fish, plants and biological filter bacteria.  There is no need for a water change after treatment.

Uses:  Aqua-Prazi kills parasitic flat worms known as trematodes or flukes, protozoan parasites such as Costia (Ichthyobodo) and internal worms.

It can also be used for treating Koi carp.

Available in pond sizes.


Mardel Coppersafe External Parasite Treatment

Fritz Aquatics Mardel Coppersafe controls a range of parasites such as Ich (Ick), anchor worm, velvet and lice.

It is claimed not to interfere with the biological process of filters, discolor the water, or harm plants, so it can be used in a set up aquarium, but it is toxic to invertebrates and some snails.

There are reports it is toxic to Plecostomus species so I would only use it in a sick bay, not in a community aquarium.

It can be used in fresh and salt water aquariums.

Available in pond sizes.


Fresh Water Test Kits

An API Freshwater Master Test Kit is a vital piece of equipment for anyone keeping fish.

Poor water quality is the biggest killer of Goldfish yet is one of the easiest  elements to control with regular water changes.  A water test will quickly tell you if the water quality is the cause of your Goldfish's ailment.

A test kit will also tell you when maintenance is required for your pond or aquarium.  It will also tell you when it is safe to stock a newly set up pond or aquarium.

A water test kit should measure:

  • pH which should be around 7.0, 7.4 being ideal for Goldfish
  • Ammonia levels which should be zero and
  • Nitrate levels which should be less than 20 ppm (parts per million).

Water Treatments

API Stress Zyme

API Stress Zyme® is used to introduce beneficial nitrifying bacterial to a new aquarium or pond filter to speed up the ammonia cycle.

Stress Zyme® contains billions of bacteria in solution that quickly colonize a filter.

The manufacturer recommends weekly doses to help break down sludge built up in gravel.

Available in pond sizes.


API Stress Coat

API Stress Coat® Water Conditioner is another vital multi-use medication as it is an aquarium water conditioner that removes chlorine, neutralizes chloramines and detoxifies heavy metals.

It contains Aloe Vera that promotes the healing and regeneration of damaged tissue. It also replaces the natural protective coating on fish that is used to form a barrier against fungal bacterial and parasitical attack.

Use it every time you make complete water changes and whenever you handle fish or if they are in a stressed environment such as a temporary container. Stress Coat® saves time as fish can be returned to their aquarium or pond immediately after a water change.

Available in pond sizes.


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