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I set up a new tank yesterday and dechlorinized the water. Why are my old fish dying in the new aquarium?

April 26, 2017aquarium dying fish tank water Yesterday

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I set up a new tank yesterday and dechlorinized the water. Why are my old fish dying in the new aquarium?

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Without more information, it would be impossible to answer this question, so it won’t be entered into the FAQs. Our guess is that you added too many fish to the tank with your old fish and they are sressing out from the rapid change in the environment. You have to use old water and gravel when you set up a new tank if you will be transferring old fish to the new aquarium.