Catching Corydoras in Your Fish Tank: Tips and Tricks

If you are a fish enthusiast, you probably know that catching Corydoras in a fish tank can be quite challenging. These bottom-dwelling catfish are quick and agile, and their small size makes them even harder to catch. However, with the right techniques and tools, you can safely catch and transfer Corydoras to a new aquarium.

catching corydoras

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In this article, we will walk you through the process of catching Corydoras and help you avoid common mistakes.

How to Prepare Your Aquarium for Catching Corydoras?

Firstly, plan the catching process. Consider when you have enough time and a calm and quiet environment, as you don’t want to stress the fish unnecessarily.

Next, turn off the aquarium lights. Reducing the brightness will help keep the fish calm and make it easier for you to catch them.

Here are some key steps to follow when preparing your fish tank for catching corydoras:

  • Remove tank decorations and hiding spots: To catch corydoras without causing them stress, it’s essential to simplify their environment by carefully removing hiding places like rocks, plants, or other decorations.
  • Lower the water level: A reduced water level will make it easier to spot corydoras and catch them quickly. Remove about half the water from the tank.
  • Be patient: Give your fish some time to adjust to the new environment after these changes.
Step Task
1 Plan the catching process
2 Turn off the aquarium lights
3 Remove tank decorations and hiding spots
4 Lower the water level
5 Be patient

Keep in mind these precautions to ensure a smooth experience for both you and your corydoras. Patience is key when it comes to preparing your aquarium for catching your fishy friends.

What Tools and Techniques to Use for Catching Corys Safely?

To catch Corydoras safely, it’s essential to prepare your aquarium and have the right tools at hand. In this section, we’ll discuss the various tools and techniques to help you catch your Corys without causing them stress or harm.

  • Fish net: Choose a soft, fine-meshed net to prevent injury to the Corys’ delicate fins. Make sure the net is large enough to accommodate the size of your fish.
  • Plastic container: A plastic container, like a small food storage box, can be used to gently scoop up your Corys along with some water from the tank. It should be clean and free of any chemicals or soap residue.
  • Siphon: A siphon helps in draining water from the tank, making it easier to catch your Corys as they have limited space to swim. Be cautious not to remove too much water as it may cause stress to your fish.
  • Two-handed technique: Use one hand to guide the fish into a corner or against the glass, and the other hand to gently scoop it up with the net or container. It can be helpful to work with another person for this method.

To catch your Corys efficiently, follow these steps:

  1. Turn off any strong lights and create a calm environment to reduce stress on your fish.
  2. Remove decorations, plants, and any obstacles to make it easier for you to catch them.
  3. Patiently use the above-mentioned tools and techniques to catch the Corys gently and with care.

Remember, patience is key when trying to catch fish, and keeping the process stress-free will lead to a smoother transition for your Corydoras. Practice caution, be gentle, and consider the well-being of your fish at all times.

What Are the Common Mistakes When Catching Corys?

Catching Corydoras can be a tricky task, and it’s easy to make mistakes that can harm your fish. Here are 5 common mistakes to avoid:

  1. Using a net that is too small: A small net or a net with large holes can cause injury to the Corydoras’ delicate fins and barbels.
  2. Chasing the fish around the tank: This can stress the fish out and make them more difficult to catch.
  3. Using chemicals to sedate the fish: This is not only dangerous to the fish, but it can also harm other fish and plants in the aquarium.
  4. Not being gentle enough: Rough handling can cause injury to the fish and make it difficult for them to adjust to their new environment.
  5. Ignoring water temperature: Rapid changes in water temperature can stress out Corydoras and make them more susceptible to disease and illness.

By avoiding these common mistakes, you can ensure that the process of catching and transferring your Corydoras to a new tank goes smoothly and safely. Remember to be patient, gentle, and careful when handling your fish to avoid any unnecessary stress or harm.

How to Handle and Transfer Corydoras to New Tank?

When you want to transfer Corydoras to a new aquarium, there are several things you should keep in mind to make the process as smooth as possible.

  • Catch them safely: To ensure that your Corydoras survive the transfer process, it is important that you catch them safely. Use the tools and techniques discussed earlier to catch them without injuring them.
  • Handle them carefully: Corydoras can become stressed easily, which can lead to health problems. Therefore, it is important that you handle them carefully. Never squeeze the fish or handle them roughly.
  • Transport them correctly: When transporting the Corydoras, use a plastic bag filled with oxygen to keep them comfortable during the journey. This will ensure that the fish are provided with enough oxygen to breathe.
  • Acclimate them properly: When the Corydoras have been successfully transported to the new aquarium, acclimate them properly. Float the bag in the new aquarium for about 10 to 15 minutes to allow the fish to acclimate to the temperature.
  • Introduce them to the new aquarium: After acclimating the fish, release them into the new aquarium carefully. Avoid sudden movements or placing them in a current. Allow the fish to settle in before feeding them.

By following these simple steps, you can ensure that your Corydoras are transferred safely to their new home.

What is the Best Way to Acclimate Corys to a New Environment?

After catching corydoras, it is important to smoothly transition them to their new home:

  • Temperature Acclimation: For a safe and smooth transfer, it is essential to maintain the same temperature as their previous environment. Temperature shock can result in death. Float the transport bag containing the Corydoras in the new tank for an hour or two to adjust the temperature.
  • Slow Water Mixing: Mixing water from different tanks or sources can cause your corydoras to go into shock. Slowly mix water from the present aquarium with water from their previous environment. Then, let the Corydoras rest in the new aquarium for a while.
  • Test Water Quality: Testing the water quality in the new environment after the fish’s arrival is crucial. Corydoras are sensitive to high levels of ammonia and nitrate. Do frequent small water changes to maintain good water quality and make sure that the water has ideal parameters like pH and hardness required for corydoras.
  • Patience: It is crucial to be patient throughout the process of acclimating the corydoras. Allow time for the fish to adjust to their new surroundings, and do not add new fish too quickly to the tank.

The best way to transition your corydoras to a new environment is to ensure that they adjust to the new temperature, slowly mix the water from the present with previous aquarium, test the water quality, and be patient throughout the process, allowing time for the fish to adapt to their new surroundings.


Catching Corydoras in your fish tank is an unnerving yet necessary task, which should be done with utmost care and precision. By preparing your aquarium beforehand and using the right tools and techniques, you can prevent stress and injury to your Corydoras.

Remember to acclimate them to their new environment slowly. By following the tips and guidelines mentioned in this article, you can safely catch and transfer your Corydoras to their new home. Do you have any other helpful tips or experiences to share? Leave your comments below!

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