
Fish are delicate creatures and, despite your best efforts, they will likely get sick at some point. Setting up a hospital tank is a great way to prevent an illness from becoming a crisis in your freshwater tank. A hospital tank is essentially a backup tank that you can use to quarantine sick fish and treat them without risking the health of the other fish in your main tank. In this article, we will discuss how to make a hospital tank, including the equipment you will need and the steps to take to ensure the best chance of recovery for your fishy friends.
| Characteristics | Values |
|---|---|
| Purpose | To quarantine sick fish and prevent the spread of disease |
| Setup | Should mimic the conditions of the main tank, including water temperature |
| Maintenance | Regular water changes to maintain water quality, clean and sanitise after use |
| Equipment | Heater, thermometer, filter, decorations/hiding places, sponge filter, activated carbon, biomedia, mesh bag, aquarium ornaments |
| Treatment | Administer medication as required, follow manufacturer's instructions |
| Quarantine Period | 4-6 weeks, or until fish is healthy and disease-free |
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What You'll Learn

Quarantine new fish
Quarantining new fish is a good practice to adopt to minimize the risk of newcomers passing on diseases or parasites to your existing fish. It is also useful if you are bringing in a batch of dwarf shrimp, which can sometimes carry diseases, especially if purchased directly from importers.
To set up a quarantine tank, you will need a separate tank that is an appropriate size for the new fish. This tank should be set up to mimic the conditions in your main tank, including temperature, water parameters, and decor, to minimize stress for the new fish. You can fill the tank with water from your main tank and add water conditioner. Install an aquarium filter and heater, and place a thermometer in the tank to monitor the temperature. Provide some shelter and hiding places for the fish, but keep the tank bare-bottom for easy cleaning. If using a plastic tub, prepare the lid by drilling holes for airflow and cutting a small rectangle for power cables and airline tubing.
Once your quarantine tank is set up, you can add your new fish and observe them for any signs of illness. If you detect any symptoms, you can administer the appropriate treatment. If you bought the fish from an online retailer or an untested source, you may want to proactively treat them with a quarantine medication trio that contains antibiotics, antifungals, and anti-parasitics. Even if the fish appear healthy, you can treat them with ParaCleanse to clear out any internal parasites that are harder to spot.
Keep the fish in the quarantine tank for a period of 2 to 6 weeks before introducing them to the main tank. During this time, continue to perform routine water changes and monitor water quality to keep the water conditions optimal. After using the quarantine tank, be sure to clean and sanitize it to prevent the spread of disease.
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Isolate sick fish
A hospital tank is a back-up tank used to quarantine sick fish and prevent the spread of disease to other fish in the main tank. It should be set up to mimic the conditions in the main tank, including water temperature, to minimise stress on the fish.
To isolate sick fish, first, set up a hospital tank. This tank should be smaller than the main tank and have a bare bottom, making it easier to clean. Install a heater and thermometer to maintain a stable temperature. Add ornaments to provide shelter and hiding places for the sick fish.
Once the hospital tank is set up, transfer the sick fish to the new tank. Observe their physical appearance and behaviour, and administer any necessary treatments. It is important to follow the recommended dosage and duration specified by the manufacturer. Keep the hospital tank clean by performing regular water changes, especially if you are not using a filter with a chemical filtration component.
After the sick fish have recovered, you can return them to the main tank. Clean and sanitise the hospital tank after each use to prevent the spread of disease.
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Clean and sanitise
To clean and sanitise a hospital fish tank, you should first remove the fish and place them back in the main tank or in a separate container. It is important to perform this step before cleaning the hospital tank to prevent the spread of disease.
Next, you should remove the filter media and either boil or throw out the sponge, as well as any live plants. The filter media must be discarded, especially in cases involving viral or bacterial infections. The sponge is not expensive and should be replaced after each use of the hospital tank.
You can then rinse out the tank with brine or a mild bleach solution, such as Milton, and leave it out to dry for a week. The stones and decorations can be boiled or bleached as well. It is important to use a separate set of nets and siphons for the hospital tank to avoid cross-contamination.
After cleaning and sanitising the hospital tank, you can refill it with water so that it is ready to use at a moment's notice. It is also important to clean and sanitise the hospital tank after each use to prevent the spread of disease.
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Mimic main tank
A hospital tank is a back-up tank used to quarantine sick fish and prevent the spread of disease to other fish in the main tank. It is important to set up a hospital tank in a way that mimics the main tank to reduce stress on the fish.
Firstly, fill the hospital tank with water as close in temperature to the main tank as possible. Drastic temperature differences can shock the fish and harm its body functions. A good quality heater and a thermometer are necessary to maintain a stable temperature.
Secondly, add a stocking or media bag filled with substrate from the main tank to the hospital tank. This provides beneficial bacteria to the hospital tank. A bare-bottom tank is easier to clean and maintain. However, some decorations and hiding places should be added to make the fish feel safe. Most fish do not do well in a completely bare tank. Plastic plants and rocks can be used as decorations, as live plants may be damaged by medication.
Thirdly, transfer the fish to the hospital tank carefully. It is important to monitor the fish and administer any necessary treatment. Keep the hospital tank clean and sanitised to prevent the spread of disease.
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Treat with medication
When treating sick fish with medication, it is important to first isolate them from their healthy tank mates. This is done to prevent the spread of disease and to stop the sick fish from being bullied by their healthy counterparts. Treating fish in a hospital tank will also reduce medication costs and prevent unnecessary exposure to antibiotics for the fish in your main tank.
Before adding medication to the hospital tank, it is important to install an aquarium filter and heater, and add fish tank ornaments to give the animals shelter. It is recommended to use a sponge filter as it offers mechanical and biological filtration, helping to keep the tank water clean without producing a great deal of flow. A good quality heater is also important to maintain a stable water temperature. It is also suggested to mark up the side of the tub with 1-gallon measurement lines to help make water changes and medicine dosing easier.
When selecting a medication, it is important to consider the type of infection your fish has. For example, Seachem Cupramine is well-known for its ability to treat ich, velvet, and external parasites, while Kordon Methylene Blue is often used to treat fungal infections. If you are unsure of the ailment, it is recommended to treat for bacterial, fungal, and parasitic infections with broad-spectrum medications such as Mardel Maracyn, Aquarium Solutions Ich-X, and Fritz ParaCleanse. In some cases, aquarium salt can be used as a second line of defense if the quarantine med trio does not seem effective.
After treatment is completed, it is important to perform regular water changes to gradually remove the medications over time. This will help the fish to build up their immune systems. It is also recommended to quarantine fish for 2-4 months before returning them to the main tank to ensure they have fully recovered.
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Frequently asked questions
A hospital tank is a back-up tank used to quarantine sick or injured fish. It helps to prevent the spread of disease to other fish in the main tank and allows you to treat the sick fish individually without medicating the entire tank.
To set up a hospital tank, first fill it with water as close in temperature to your main tank as possible. Install an aquarium heater to maintain a stable temperature and place a thermometer in the tank to monitor it. Add some substrate from your main tank into a mesh bag and place it in the hospital tank. Include a few decorations and hiding places to make the fish feel safe, but avoid live plants as they may be affected by medication. Finally, transfer the fish carefully to the hospital tank.
If you know what disease the fish have, treat them with the specific medication for that illness and follow the manufacturer's instructions. If you are unsure, follow general treatment advice such as frequent water changes and serenity, and perhaps add some Melafix to aid recovery.
Keep the fish in the hospital tank until their symptoms have cleared. Then, wait another few weeks to a few months before returning them to your main tank to ensure they are fully recovered and to prevent a recurrence of the disease.











































