Common Aquarium Sicknesses

summary

Have you recently made changes in your aquarium or have brought new fish home?
Do you believe your fish may be sick?

The most common reason a fish may be sick is from parasites (internal or external). There is also fungal, bacterial or viral infections also.

It’s a good idea to have a basic understanding of the signs & symptoms for the common diseases so you know the best treatment pathway for your fish.

Read below on common diseases shown in tropical fish, and how you can try help treat them at home.

The first step we recommend is testing your water quality. Should you not have a master water testing kit at home, bring in a 40mL water sample into store for a FREE water testing and consultation.

Let’s dive in!

STRESS and fish ILLNESS

It’s imperative to ensure your fish have the right water quality for their species, and are introduced into your aquarium through correct acclimation processes. Without these, the fish as susceptible to stress and in result, illnesses.

ich

What is Ich?
Ich (Ichthobodo) is a protozoan parasitic infection which usually appears in stressed fish. This stress can be from poor water conditions, overcrowding of the tank or from recent travel. This stress lowers the fish’s immune system and allows the parasite to take over, which can be fatal if left untreated.


Signs & Symptoms
This infection attacks the fish’s gills and skin, causing a grey colour to their skin and white spots (almost like they have salt all over them). Your fish will appear lethargic, weak and refusing food. They may rub their sides on the tank or spend their time at the top of the tank gulping for air.

Treatment for Ich
It’s important to read the labels of your medication bottles, as most will require you to remove any carbon from your filter (as this will absorb any medication you add to the water)

Common treatments for ich are medicated fish tanks with aquarium salt, potassium permanganate or copper sulfate. Here at Nick’s, we recommend Ichonex (a copper based product).

  • Treat at the rate of 5mL per 40 litres on Žthe first day and on days 2 & 3 at 1/2 of the initial rate (2.5mL/40L).
  • To maximize result, 1/2 the daily dosage, adding it to the tank twice (morning and night).

Important note: The copper component is more toxic at low pH, so keep pH above 7.5.

Raising the temperature by 2-3 degree celsius will also assist with shortening the life cycle of the parasite thereby targeting the affected stage of ich life cycle, more effectively.

 

constipation

Is my fish constipated?

Like humans, constipation can make your fish feel unwell. There are two main causes of constipation in fish:
1. Improper diet
2. Parasite infections

 

 

Symptoms of Constipation

If your fish is constipated, you may notice a bloated abdomen. It’s imperative to address this as soon as possible, as constipation can cause them to develop swim bladder disease.

Treatment of Constipation
Like the treatment of constipation for humans, to treat fish constipation we increase their fiber in their diet, and you could also provide a de-wormer.
Another method to reduce constipation in fish is to dose your tank with 1 – 3 teaspoons (every 18 litres) of aquarium salt.

Note: The salt will act as a muscle relaxant which will help them pass faeces.

bacterial infection

What causes a bacterial infection?


When your fish are stressed from poor water conditions or diet, it will reduce their immune system. With this lower immune system, if your fish was to injure part of their body (say on some substrate or decor), it will allow common bacteria to enter their body. The most common bacteria is Aeromonas salmonicid.

 

 

Signs & Symptoms: 

Common signs and symptoms include:

• Red spot on the body
• Ulcers on gills
• Enlarged eyes
• Swollen abdomen

Treatment of bacterial infections:
You can choose to use a quarantine tank to treat the fish, however before they’re returned the tank will need to be corrected and cleaned. You could always treat the tank they’re in, which will work as a preventative for any other fish in the tank too. 

To treat the bacterial infection, a medication we sell and often recommend are either of these treatments: Tri- sulfa tablets, Bactonex or Melafix. With all three options, removing carbon from your filter is required.



Tri-sulfa:
• Pre-dissolve tablets in a disposable cup before addition to the aquarium water.
• Use 1 tablet per 40 litres of aquarium water. In the case of severe infestation use at the rate of one tablet per 20 litres of aquarium water.

Bactonex:
• Use at water change time and when adding new fish.
• Use 10mL per 40 litres.
• Repeat after 5 days if necessary.

Melafix:
• Shake well, add 5ml per 190 litres of aquarium water
• Dose daily for 7 days, after 7 days make a 25% water change.
• Continue if necessary

$18.50

Blue Planet Tri Sulfa medication aids in the control of common diseases in aquarium fish Shipping = Small

Aquarium Medications

Aquasonic Bactonex 100ml

$10.00

Bactonex assists in the prevention of bacterial, fungal and protozoal (Velvet, whitespot, chilodonella, Trichodina & Trichodinella) infections in fresh and salt water fish. Shipping = Small

Aquarium Medications

Aquasonic Bactonex 250ml

$16.00

Bactonex assists in the prevention of bacterial, fungal and protozoal (Velvet, whitespot, chilodonella, Trichodina & Trichodinella) infections in fresh and salt water fish. Shipping = Small

Aquarium Medications

API Melafix 118ml

$19.50

Treat bacterial infections in your fish and reduce the risk of spreading illness to other fish with API Melafix Freshwater Fish Bacterial Infection Remedy. Shipping = Small

Aquarium Medications

API Melafix 237ml

$28.50

MELAFIX smooths the transition from store to home by reducing the risk of your fish developing a disease. The fish you bought may already carry a disease. Shipping = Small

fungal infection

What causes fungal infections in fish?

Fungal outbreaks are usually caused by stressful environments, or poor water quality. It’s important to treat your fish, but also look at the environment to determine the cause of stress.

The two most common fungal infections found in freshwater fish are:

• Saprolegnia and 

• Ichthyophonus hoferi 

Symptoms of Fungal Infections

Most common signs seen with fungal infections are a grey cotton-like growth on their skin, gills, fins and even around their eyes. This type of infection will cause damage to their internal organs.

Treatment of Fungal Infections

We would encourage checking your water parameters, and then doing a full tank clean. Depending on your species of fish, you may raise the temperature of the tank slightly as fungal infections will thrive in colder temperatures.

You can then use medication such as Aquasonic Fungonex.
• Add 5mL per 20 litres.
• Repeat treatment after 3 days if necessary.

Fungal infections can be prevented. To control mild fungus infections (or fungus on eggs), you can use the product methylene blue. As this product is not as strong as other medications, it is really only effective as a preventative method.

For preventative method, use 5mL per 20 Litres of aquarium water each day for 4 days for both freshwater and marine tanks.

 

 

Aquarium Medications

Aquasonic Fungonex 100ml

$10.00

Aquasonic Fungonex is an effective treatment for various fungal infections, fin and tail rot, cloudy eyes, red or damaged fins and to prevent fungal infections to injuries on the body. Shipping = Small

Aquarium Medications

Aquasonic Fungonex 250ml

$16.00

Aquasonic Fungonex is an effective treatment for various fungal infections, fin and tail rot, cloudy eyes, red or damaged fins and to prevent fungal infections to injuries on the body. Shipping = Small

Aquarium Medications

Aquasonic Methylene Blue 100ml

$10.00

Treatment and control for mild fungus infections and fungus on eggs. Shipping = Small

Aquarium Medications

Aquasonic Methylene Blue 250ml

$17.50

Treatment and control for mild fungus infections and fungus on eggs. Shipping = Small

dropsy

What is Dropsy & what causes it?

If your fish appears bloated, there may be a few reasons (obesity, constipation, full of eggs, full of worms, bacterial infection) or dropsy (also known as bloat).
The cause of dropsy can be from multiple reasons, the main culprit is poor water quality, viral infections, prolonged stress periods causing weak immune system or sudden change in the water conditions.

Signs & Symptoms:
Swollen abdomen where the scales look like pinecones (See picture above)

•  Eyes swelling and buldging (or become sunken)
•  Loss of colour in gills
• Pale faeces
• Becoming lethargic
• Hovering near the top or bottom of aquarium

Treatment for Dropsy

Dropsy is a serious disease which in most cases leads to death in fish. A vet visit is encouraged. To try remedy at home in the meantime, it’s a good idea to first check your water parameters, and if you can remove any stress factors (such as the poor water quality, overcrowding, parasites). Ideally, a quarantine tank away from high traffic areas.

An antibacterial like melafix is recommended to help reduce stress, heal wounds and promote re-growth of any damaged fin rays and tissue.

Moving forward, monitor your fish and ensure to maintain best water quality.
Reduce any stressors you see in their tank.

We hope this was helpful!

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