The Planted Tank Forum - View Single Post - Can I put another betta in tank after death?
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post #2 of (permalink) Old 02-14-2012, 10:45 PM
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Dropsy can be caused by various things - including poor water quality and bacterial infections. If it was a bacterial infection that caused it then there is a good chance it can be passed on to a new fish. There is really no way to know.

If it were me I would tear the tank down, disinfect everything I could, replace the gravel, and start over. I do that any time I lose a betta and put a new one in the tank regardless of why it died, simply because a new betta that has been sitting in a cup full of dirty water for whatever length of time will probably have a weakened immune system.
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