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- #244,981
We all make mistakes. You didnt know. Now you do. The reason their dying now is because you have them in basically tap water. A tank has to cycle and build up a good bacteria in order for the fish to do good. New gravel, new tank, new filter. Not really a good thing. Now if you happen to have anything from the old tank that may still be wet you could possible save the rest of the fish. Even the old gravel would help.