How to Quarantine New Fish

Before you add a new fish to your aquarium, make sure it slowly adjusts to the new water. The process is known as acclimation. If you skip acclimation, it is one of the common reasons new fish die after you bring them home. It helps them get used to the water temperature and pH, reducing stress and preventing shock. 

Check out Why Regular Aquarium Water Testing Is Crucial for Your Fish’s Health.

Get a Spare Tank.

Many people who are new to fishkeeping don't know that a quarantine tank is the key to keeping fish healthy. A quarantine tank is a separate aquarium used to house new or sick fish for a period of time. It allows you to watch them closely, treat them, and stop the disease from spreading to other fish. Once they are healthy and free from illness, you can safely move them to the main aquarium. 

Even if you are using a quarantine tank, you should still acclimate the new fish before you add them to the tank. In case you don't have a quarantine tank, buy fish only from healthy-looking tanks. 

Do not buy fish from tanks where fish look sick, injured, or dead. Also, keep in mind not to pour the water from the fish store bag into your aquarium. It can contain harmful bacteria, disease, or parasites. So, instead, you can use a net to move the fish and throw the bag of water away. 

How To Set Up a Quarantine Fish Tank?

Keep your quarantine tank in a different room from your main aquarium. It helps prevent germs and diseases from spreading between tanks.

1. You can use separate nets, siphons, and other tools for the quarantine tank. It helps reduce the risk of contamination. First, wash your hands after working in a quarantine tank before you touch your main aquarium. 

2. If you are using a plastic storage hub instead of a regular aquarium, drill a few small holes in the lid. It allows the fresh air to get in. Cut a small opening on the side of the power cords and airline tubing. You can also mark 1-gallon (or 5-liter) lines on the side of the tub. It becomes easier to measure water changes and add the right amount of medication.

3. Fill the aquarium with water and add a water conditioner. It helps remove harmful chemicals. 

4. Install a filter and heater, then add a few decorations or hiding places so that the fish can feel safe and less stressed. Do not add gravel or sand to the bottom of the tank. Keep it bare. Doing so makes it easier to clean the tank and check the fish's waste for signs of illness.

5. Add the fish to the aquarium and watch them closely. Look for even a small change in their appearance or behavior, such as damaged fins, white spots, unusual swimming, or a loss of appetite. If medication is needed, first remove activated carbon from the filter and turn off any UV sterilizer, as they can reduce the effectiveness of the medication. 

• If you know your fish has a particular disease, use the appropriate medication and follow the dosage and treatment instructions on the product label. 

• If you buy fish from a trusted local fish store breeder, simply feed them and keep them under observation for a few days. If you see any signs of illness, treat them with the right medication. If they look healthy, you can treat them with a medication as a precaution. Make sure the medication is effective against internal parasites that are difficult to see. 

• If you buy fish online, from a large pet store chain, or another source you are not sure about, it is a good idea to treat them as a precaution during quarantine. Many fishkeepers use a combination of medications and follow the dosage instructions given on each product. During treatment, don't feed the fish if the medication instructions recommend not feeding. Doing so can help medicines work more effectively and give the fish enough time to recover.

6. When the treatment is done, make sure to regularly change the water on a weekly basis to slowly remove any leftover medication from the water. Feed your fish with high-quality food, such as frozen fish food. It helps them regain enough strength and support for their immune system. 

7. Keep your new fish in quarantine for about 4-6 weeks after you notice the last sign of illness or the last fish death. It helps ensure they are fully healthy before you move them to your main aquarium. If you want to be extra careful, you can place one or two healthy fish from your main tank in the quarantine tank. If none of the fish become sick over time, it is safe to move the quarantined fish to the main aquarium. 

8. Once quarantine is complete, you need to clean the tank and all its equipment. Keep everything completely dry before you store it. If you plan to buy more fish soon, you can leave the tank running so it is ready to use again whenever needed.

Fish Acting Weird After a Water Change? Know How to Calm Them.

Protect Your Aquarium With Proper Quarantine

If you want to keep your aquarium healthy and disease-free, the only way you can do so is to quarantine new fish. Even fish that look healthy carry bacteria, parasites, and other infections without showing any symptoms. A quarantine tank can give you enough time to observe new fish, help them recover from the stress, and treat health issues. 

When you keep new fish in quarantine, you actually prevent disease from spreading to your existing fish. During that 4-6 week period, you can closely monitor their behavior. Make sure they are eating well and confirm they are healthy enough to join your home tank.