If you've recently introduced new fish to your aquarium and have noticed that your other fish are becoming sick or dying, there could be a variety of causes at play. Here are a few potential explanations to consider:
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Disease: It's possible that the new fish could have brought diseases or infections with them, which could then be transmitted to the other fish in the tank.
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Water quality: Poor water quality can be harmful to fish and may cause them to become sick or die. Make sure that you are performing regular water changes and testing the water to ensure that it is within the proper parameters for your fish.
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Compatibility: It's important to choose fish that are compatible in terms of size, temperament, and water conditions in order to minimize the risk of problems.
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Stress: Fish are sensitive to stress and can become sick or die if they are subjected to high levels of stress. Make sure that you are providing your fish with a suitable environment, including plenty of hiding places and appropriate substrate.
If you're unsure of the cause of the problems with your fish, you may want to consider speaking with a professional aquarium specialist or consulting with other hobbyists who may have experienced similar issues. It's important to identify the cause of the problems and take the appropriate steps to fix the issue in order to try to save your fish. In the meantime, you may want to consider isolating the sick fish from the healthy ones and treating them with medications or other remedies recommended by a professional. Keep in mind that it may not always be possible to save sick fish, but taking these steps can help improve their chances of survival.
