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It could be they were sick BEFORE you bought them. Often times fish that are bought at pet stores don't live very long. I myself had a fantail goldfish bought at a small pet store that lived 6 years. But that seems to be the exception, not the rule.

I would look at all the fish in the store before I bought one. Often times what other fish look like might be an indication of how well the fish are. Fish are finicky. They require such care, and a certain environment to survive, so it can be tricky to care for them.

I think it could be new tank syndrome.When you firstset up your tank you must always (seed)your filter.To do this add only 1 or two hardy fish and feed sparingly,you can also buy a product called filter start which will let you add more fish after aweek or two.youshould also test your pH,nitrite,and ammonia levels,ammonia is a killer of fish.

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Q: What would cause a tropical fish to die after only a few weeks?
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Can you put tropical fish in tank with goldfish?

No goldfish would prefer to have a lower temperature than any type of tropical fish, however some goldfish can withstand higher temperature if they are slowly acclimated to it! But in the long run goldfish would be happy with other goldfish and tropical fish with tropical fish... there is a reason you don't see the goldfish with the tropical fish in a good aquatic store.


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