If you've been having issues with snails in your aquarium, there could be a variety of causes at play. Here are a few potential explanations to consider:
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Water quality: Poor water quality can be harmful to snails and may cause them to die. Make sure that you're performing regular water changes and testing the water to ensure that it is within the proper parameters for the species of snails you're keeping.
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Compatibility with other fish: Some fish may be aggressive towards snails and may attack or harm them. If you have aggressive fish in your tank, this could be causing the snails to die.
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Lack of suitable food: Snails require a varied diet that includes algae, vegetables, and supplements specifically formulated for snails. Make sure that you are providing your snails with the appropriate types of food and that they have access to the nutrients they need.
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Stress: Snails are sensitive to stress and can become sick or die if they are subjected to high levels of stress. Provide your snails with a suitable environment, including plenty of hiding places and a substrate that they can burrow in.
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Disease: Snails can become sick or infected with diseases, just like any other animal. If you suspect that your snails may be sick, it's important to isolate them from the other fish in your tank and seek the advice of a veterinarian or other expert.
Another potential cause of issues with snails in your aquarium is a high level of CO2 in the water. CO2 is a gas that is produced by the breakdown of organic matter in the water and can be harmful to aquatic life if the levels become too high. Regularly test the CO2 levels in your tank and take steps to reduce them if necessary to ensure the health and well-being of your snails.